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/execution_test.go

@@ -10,7 +10,7 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
-	"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"
 )
@@ -18,7 +18,7 @@ import (
 func TestServer_SetExecution_Request(t *testing.T) {
 	instance := integration.NewInstance(CTX)
 	isolatedIAMOwnerCTX := instance.WithAuthorizationToken(CTX, integration.UserTypeIAMOwner)
-	targetResp := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://notexisting", domain.TargetTypeWebhook, false)
+	targetResp := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://notexisting", target_domain.TargetTypeWebhook, false)
 
 	tests := []struct {
 		name        string
@@ -175,7 +175,7 @@ func assertSetExecutionResponse(t *testing.T, creationDate, setDate time.Time, e
 func TestServer_SetExecution_Response(t *testing.T) {
 	instance := integration.NewInstance(CTX)
 	isolatedIAMOwnerCTX := instance.WithAuthorizationToken(CTX, integration.UserTypeIAMOwner)
-	targetResp := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://notexisting", domain.TargetTypeWebhook, false)
+	targetResp := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://notexisting", target_domain.TargetTypeWebhook, false)
 
 	tests := []struct {
 		name        string
@@ -319,7 +319,7 @@ func TestServer_SetExecution_Response(t *testing.T) {
 func TestServer_SetExecution_Event(t *testing.T) {
 	instance := integration.NewInstance(CTX)
 	isolatedIAMOwnerCTX := instance.WithAuthorizationToken(CTX, integration.UserTypeIAMOwner)
-	targetResp := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://notexisting", domain.TargetTypeWebhook, false)
+	targetResp := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://notexisting", target_domain.TargetTypeWebhook, false)
 
 	tests := []struct {
 		name        string
@@ -482,7 +482,7 @@ func TestServer_SetExecution_Event(t *testing.T) {
 func TestServer_SetExecution_Function(t *testing.T) {
 	instance := integration.NewInstance(CTX)
 	isolatedIAMOwnerCTX := instance.WithAuthorizationToken(CTX, integration.UserTypeIAMOwner)
-	targetResp := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://notexisting", domain.TargetTypeWebhook, false)
+	targetResp := instance.CreateTarget(isolatedIAMOwnerCTX, t, "", "https://notexisting", target_domain.TargetTypeWebhook, false)
 
 	tests := []struct {
 		name        string