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/feature/v2/converter_test.go

@@ -23,7 +23,6 @@ func Test_systemFeaturesToCommand(t *testing.T) {
 		OidcTriggerIntrospectionProjections: gu.Ptr(false),
 		OidcLegacyIntrospection:             nil,
 		UserSchema:                          gu.Ptr(true),
-		Actions:                             gu.Ptr(true),
 		OidcTokenExchange:                   gu.Ptr(true),
 		ImprovedPerformance:                 nil,
 		OidcSingleV1SessionTermination:      gu.Ptr(true),
@@ -37,7 +36,6 @@ func Test_systemFeaturesToCommand(t *testing.T) {
 		TriggerIntrospectionProjections: gu.Ptr(false),
 		LegacyIntrospection:             nil,
 		UserSchema:                      gu.Ptr(true),
-		Actions:                         gu.Ptr(true),
 		TokenExchange:                   gu.Ptr(true),
 		ImprovedPerformance:             nil,
 		OIDCSingleV1SessionTermination:  gu.Ptr(true),
@@ -74,10 +72,6 @@ func Test_systemFeaturesToPb(t *testing.T) {
 			Level: feature.LevelSystem,
 			Value: true,
 		},
-		Actions: query.FeatureSource[bool]{
-			Level: feature.LevelSystem,
-			Value: true,
-		},
 		TokenExchange: query.FeatureSource[bool]{
 			Level: feature.LevelSystem,
 			Value: false,
@@ -132,10 +126,6 @@ func Test_systemFeaturesToPb(t *testing.T) {
 			Enabled: false,
 			Source:  feature_pb.Source_SOURCE_SYSTEM,
 		},
-		Actions: &feature_pb.FeatureFlag{
-			Enabled: true,
-			Source:  feature_pb.Source_SOURCE_SYSTEM,
-		},
 		ImprovedPerformance: &feature_pb.ImprovedPerformanceFeatureFlag{
 			ExecutionPaths: []feature_pb.ImprovedPerformance{feature_pb.ImprovedPerformance_IMPROVED_PERFORMANCE_ORG_BY_ID},
 			Source:         feature_pb.Source_SOURCE_SYSTEM,
@@ -173,7 +163,6 @@ func Test_instanceFeaturesToCommand(t *testing.T) {
 		OidcLegacyIntrospection:             nil,
 		UserSchema:                          gu.Ptr(true),
 		OidcTokenExchange:                   gu.Ptr(true),
-		Actions:                             gu.Ptr(true),
 		ImprovedPerformance:                 nil,
 		WebKey:                              gu.Ptr(true),
 		DebugOidcParentError:                gu.Ptr(true),
@@ -191,7 +180,6 @@ func Test_instanceFeaturesToCommand(t *testing.T) {
 		LegacyIntrospection:             nil,
 		UserSchema:                      gu.Ptr(true),
 		TokenExchange:                   gu.Ptr(true),
-		Actions:                         gu.Ptr(true),
 		ImprovedPerformance:             nil,
 		WebKey:                          gu.Ptr(true),
 		DebugOIDCParentError:            gu.Ptr(true),
@@ -231,10 +219,6 @@ func Test_instanceFeaturesToPb(t *testing.T) {
 			Level: feature.LevelInstance,
 			Value: true,
 		},
-		Actions: query.FeatureSource[bool]{
-			Level: feature.LevelInstance,
-			Value: true,
-		},
 		TokenExchange: query.FeatureSource[bool]{
 			Level: feature.LevelSystem,
 			Value: false,
@@ -293,10 +277,6 @@ func Test_instanceFeaturesToPb(t *testing.T) {
 			Enabled: true,
 			Source:  feature_pb.Source_SOURCE_INSTANCE,
 		},
-		Actions: &feature_pb.FeatureFlag{
-			Enabled: true,
-			Source:  feature_pb.Source_SOURCE_INSTANCE,
-		},
 		OidcTokenExchange: &feature_pb.FeatureFlag{
 			Enabled: false,
 			Source:  feature_pb.Source_SOURCE_SYSTEM,