fix: remove action feature flag and include execution (#9727)

# Which Problems Are Solved

Actions v2 is not a feature flag anymore, include functionality on
executions is not used and json tags of proto messages are handled
incorrectly.

# How the Problems Are Solved

- Remove actions from the feature flags on system and instance level
- Remove include type on executions, only in the API, later maybe in the
handling logic as well
- Use protojson in request and response handling of actions v2

# Additional Changes

- Correct integration tests for request and response handling
- Use json.RawMessage for events, so that the event payload is not
base64 encoded
- Added separate context for async webhook calls, that executions are
not cancelled when called async

# Additional Context

Related to #9759 
Closes #9710

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/api/grpc/action/v2beta/integration_test/server_test.go

@@ -7,14 +7,6 @@ import (
 	"os"
 	"testing"
 	"time"
-
-	"github.com/muhlemmer/gu"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-
-	"github.com/zitadel/zitadel/internal/integration"
-	action "github.com/zitadel/zitadel/pkg/grpc/action/v2beta"
-	"github.com/zitadel/zitadel/pkg/grpc/feature/v2"
 )
 
 var (
@@ -29,41 +21,3 @@ func TestMain(m *testing.M) {
 		return m.Run()
 	}())
 }
-
-func ensureFeatureEnabled(t *testing.T, instance *integration.Instance) {
-	ctx := instance.WithAuthorization(CTX, integration.UserTypeIAMOwner)
-	f, err := instance.Client.FeatureV2.GetInstanceFeatures(ctx, &feature.GetInstanceFeaturesRequest{
-		Inheritance: true,
-	})
-	require.NoError(t, err)
-	if f.Actions.GetEnabled() {
-		return
-	}
-	_, err = instance.Client.FeatureV2.SetInstanceFeatures(ctx, &feature.SetInstanceFeaturesRequest{
-		Actions: gu.Ptr(true),
-	})
-	require.NoError(t, err)
-
-	retryDuration, tick := integration.WaitForAndTickWithMaxDuration(ctx, 5*time.Minute)
-	require.EventuallyWithT(t,
-		func(ttt *assert.CollectT) {
-			f, err := instance.Client.FeatureV2.GetInstanceFeatures(ctx, &feature.GetInstanceFeaturesRequest{
-				Inheritance: true,
-			})
-			assert.NoError(ttt, err)
-			assert.True(ttt, f.Actions.GetEnabled())
-		},
-		retryDuration,
-		tick,
-		"timed out waiting for ensuring instance feature")
-
-	retryDuration, tick = integration.WaitForAndTickWithMaxDuration(ctx, 5*time.Minute)
-	require.EventuallyWithT(t,
-		func(ttt *assert.CollectT) {
-			_, err := instance.Client.ActionV2beta.ListExecutionMethods(ctx, &action.ListExecutionMethodsRequest{})
-			assert.NoError(ttt, err)
-		},
-		retryDuration,
-		tick,
-		"timed out waiting for ensuring instance feature call")
-}