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.go

@@ -22,7 +22,6 @@ func systemFeaturesToCommand(req *feature_pb.SetSystemFeaturesRequest) (*command
 		TriggerIntrospectionProjections: req.OidcTriggerIntrospectionProjections,
 		LegacyIntrospection:             req.OidcLegacyIntrospection,
 		UserSchema:                      req.UserSchema,
-		Actions:                         req.Actions,
 		TokenExchange:                   req.OidcTokenExchange,
 		ImprovedPerformance:             improvedPerformanceListToDomain(req.ImprovedPerformance),
 		OIDCSingleV1SessionTermination:  req.OidcSingleV1SessionTermination,
@@ -41,7 +40,6 @@ func systemFeaturesToPb(f *query.SystemFeatures) *feature_pb.GetSystemFeaturesRe
 		OidcLegacyIntrospection:             featureSourceToFlagPb(&f.LegacyIntrospection),
 		UserSchema:                          featureSourceToFlagPb(&f.UserSchema),
 		OidcTokenExchange:                   featureSourceToFlagPb(&f.TokenExchange),
-		Actions:                             featureSourceToFlagPb(&f.Actions),
 		ImprovedPerformance:                 featureSourceToImprovedPerformanceFlagPb(&f.ImprovedPerformance),
 		OidcSingleV1SessionTermination:      featureSourceToFlagPb(&f.OIDCSingleV1SessionTermination),
 		DisableUserTokenEvent:               featureSourceToFlagPb(&f.DisableUserTokenEvent),
@@ -62,7 +60,6 @@ func instanceFeaturesToCommand(req *feature_pb.SetInstanceFeaturesRequest) (*com
 		LegacyIntrospection:             req.OidcLegacyIntrospection,
 		UserSchema:                      req.UserSchema,
 		TokenExchange:                   req.OidcTokenExchange,
-		Actions:                         req.Actions,
 		ImprovedPerformance:             improvedPerformanceListToDomain(req.ImprovedPerformance),
 		WebKey:                          req.WebKey,
 		DebugOIDCParentError:            req.DebugOidcParentError,
@@ -83,7 +80,6 @@ func instanceFeaturesToPb(f *query.InstanceFeatures) *feature_pb.GetInstanceFeat
 		OidcLegacyIntrospection:             featureSourceToFlagPb(&f.LegacyIntrospection),
 		UserSchema:                          featureSourceToFlagPb(&f.UserSchema),
 		OidcTokenExchange:                   featureSourceToFlagPb(&f.TokenExchange),
-		Actions:                             featureSourceToFlagPb(&f.Actions),
 		ImprovedPerformance:                 featureSourceToImprovedPerformanceFlagPb(&f.ImprovedPerformance),
 		WebKey:                              featureSourceToFlagPb(&f.WebKey),
 		DebugOidcParentError:                featureSourceToFlagPb(&f.DebugOIDCParentError),