perf(actionsv2): execution target router (#10564)

# Which Problems Are Solved

The event execution system currently uses a projection handler that
subscribes to and processes all events for all instances. This creates a
high static cost because the system over-fetches event data, handling
many events that are not needed by most instances. This inefficiency is
also reflected in high "rows returned" metrics in the database.

# How the Problems Are Solved

Eliminate the use of a project handler. Instead, events for which
"execution targets" are defined, are directly pushed to the queue by the
eventstore. A Router is populated in the Instance object in the authz
middleware.

- By joining the execution targets to the instance, no additional
queries are needed anymore.
- As part of the instance object, execution targets are now cached as
well.
- Events are queued within the same transaction, giving transactional
guarantees on delivery.
- Uses the "insert many fast` variant of River. Multiple jobs are queued
in a single round-trip to the database.
- Fix compatibility with PostgreSQL 15

# Additional Changes

- The signing key was stored as plain-text in the river job payload in
the DB. This violated our [Secrets
Storage](https://zitadel.com/docs/concepts/architecture/secrets#secrets-storage)
principle. This change removed the field and only uses the encrypted
version of the signing key.
- Fixed the target ordering from descending to ascending.
- Some minor linter warnings on the use of `io.WriteString()`.

# Additional Context

- Introduced in https://github.com/zitadel/zitadel/pull/9249
- Closes https://github.com/zitadel/zitadel/issues/10553
- Closes https://github.com/zitadel/zitadel/issues/9832
- Closes https://github.com/zitadel/zitadel/issues/10372
- Closes https://github.com/zitadel/zitadel/issues/10492

---------

Co-authored-by: Stefan Benz <46600784+stebenz@users.noreply.github.com>
(cherry picked from commit a9ebc06c77)

internal/api/grpc/action/v2/integration_test/target_test.go

@@ -12,7 +12,7 @@ import (
 	"github.com/stretchr/testify/assert"
 	"google.golang.org/protobuf/types/known/durationpb"
 
-	"github.com/zitadel/zitadel/internal/domain"
+	target_domain "github.com/zitadel/zitadel/internal/execution/target"
 	"github.com/zitadel/zitadel/internal/integration"
 	"github.com/zitadel/zitadel/pkg/grpc/action/v2"
 )
@@ -26,7 +26,7 @@ func TestServer_CreateTarget(t *testing.T) {
 		signingKey   bool
 	}
 	alreadyExistingTargetName := integration.TargetName()
-	instance.CreateTarget(isolatedIAMOwnerCTX, t, alreadyExistingTargetName, "https://example.com", domain.TargetTypeAsync, false)
+	instance.CreateTarget(isolatedIAMOwnerCTX, t, alreadyExistingTargetName, "https://example.com", target_domain.TargetTypeAsync, false)
 	tests := []struct {
 		name string
 		ctx  context.Context
@@ -263,7 +263,7 @@ func TestServer_UpdateTarget(t *testing.T) {
 		{
 			name: "missing permission",
 			prepare: func(request *action.UpdateTargetRequest) {
-				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", domain.TargetTypeWebhook, false).GetId()
+				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", target_domain.TargetTypeWebhook, false).GetId()
 				request.Id = targetID
 			},
 			args: args{
@@ -290,7 +290,7 @@ func TestServer_UpdateTarget(t *testing.T) {
 		{
 			name: "no change, ok",
 			prepare: func(request *action.UpdateTargetRequest) {
-				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", domain.TargetTypeWebhook, false).GetId()
+				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", target_domain.TargetTypeWebhook, false).GetId()
 				request.Id = targetID
 			},
 			args: args{
@@ -308,7 +308,7 @@ func TestServer_UpdateTarget(t *testing.T) {
 		{
 			name: "change name, ok",
 			prepare: func(request *action.UpdateTargetRequest) {
-				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", domain.TargetTypeWebhook, false).GetId()
+				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", target_domain.TargetTypeWebhook, false).GetId()
 				request.Id = targetID
 			},
 			args: args{
@@ -326,7 +326,7 @@ func TestServer_UpdateTarget(t *testing.T) {
 		{
 			name: "regenerate signingkey, ok",
 			prepare: func(request *action.UpdateTargetRequest) {
-				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", domain.TargetTypeWebhook, false).GetId()
+				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", target_domain.TargetTypeWebhook, false).GetId()
 				request.Id = targetID
 			},
 			args: args{
@@ -344,7 +344,7 @@ func TestServer_UpdateTarget(t *testing.T) {
 		{
 			name: "change type, ok",
 			prepare: func(request *action.UpdateTargetRequest) {
-				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", domain.TargetTypeWebhook, false).GetId()
+				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", target_domain.TargetTypeWebhook, false).GetId()
 				request.Id = targetID
 			},
 			args: args{
@@ -366,7 +366,7 @@ func TestServer_UpdateTarget(t *testing.T) {
 		{
 			name: "change url, ok",
 			prepare: func(request *action.UpdateTargetRequest) {
-				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", domain.TargetTypeWebhook, false).GetId()
+				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", target_domain.TargetTypeWebhook, false).GetId()
 				request.Id = targetID
 			},
 			args: args{
@@ -384,7 +384,7 @@ func TestServer_UpdateTarget(t *testing.T) {
 		{
 			name: "change timeout, ok",
 			prepare: func(request *action.UpdateTargetRequest) {
-				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", domain.TargetTypeWebhook, false).GetId()
+				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", target_domain.TargetTypeWebhook, false).GetId()
 				request.Id = targetID
 			},
 			args: args{
@@ -402,7 +402,7 @@ func TestServer_UpdateTarget(t *testing.T) {
 		{
 			name: "change type async, ok",
 			prepare: func(request *action.UpdateTargetRequest) {
-				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", domain.TargetTypeAsync, false).GetId()
+				targetID := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://example.com", target_domain.TargetTypeAsync, false).GetId()
 				request.Id = targetID
 			},
 			args: args{
@@ -498,7 +498,7 @@ func TestServer_DeleteTarget(t *testing.T) {
 			ctx:  iamOwnerCtx,
 			prepare: func(request *action.DeleteTargetRequest) (time.Time, time.Time) {
 				creationDate := time.Now().UTC()
-				targetID := instance.CreateTarget(iamOwnerCtx, t, "", "https://example.com", domain.TargetTypeWebhook, false).GetId()
+				targetID := instance.CreateTarget(iamOwnerCtx, t, "", "https://example.com", target_domain.TargetTypeWebhook, false).GetId()
 				request.Id = targetID
 				return creationDate, time.Time{}
 			},
@@ -510,7 +510,7 @@ func TestServer_DeleteTarget(t *testing.T) {
 			ctx:  iamOwnerCtx,
 			prepare: func(request *action.DeleteTargetRequest) (time.Time, time.Time) {
 				creationDate := time.Now().UTC()
-				targetID := instance.CreateTarget(iamOwnerCtx, t, "", "https://example.com", domain.TargetTypeWebhook, false).GetId()
+				targetID := instance.CreateTarget(iamOwnerCtx, t, "", "https://example.com", target_domain.TargetTypeWebhook, false).GetId()
 				request.Id = targetID
 				instance.DeleteTarget(iamOwnerCtx, t, targetID)
 				return creationDate, time.Now().UTC()