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/query/system_features_test.go

@@ -61,10 +61,6 @@ func TestQueries_GetSystemFeatures(t *testing.T) {
 						context.Background(), aggregate,
 						feature_v2.SystemUserSchemaEventType, false,
 					)),
-					eventFromEventPusher(feature_v2.NewSetEvent(
-						context.Background(), aggregate,
-						feature_v2.SystemActionsEventType, true,
-					)),
 				),
 			),
 			want: &SystemFeatures{
@@ -87,10 +83,6 @@ func TestQueries_GetSystemFeatures(t *testing.T) {
 					Level: feature.LevelSystem,
 					Value: false,
 				},
-				Actions: FeatureSource[bool]{
-					Level: feature.LevelSystem,
-					Value: true,
-				},
 			},
 		},
 		{
@@ -113,10 +105,6 @@ func TestQueries_GetSystemFeatures(t *testing.T) {
 						context.Background(), aggregate,
 						feature_v2.SystemUserSchemaEventType, false,
 					)),
-					eventFromEventPusher(feature_v2.NewSetEvent(
-						context.Background(), aggregate,
-						feature_v2.SystemActionsEventType, false,
-					)),
 					eventFromEventPusher(feature_v2.NewResetEvent(
 						context.Background(), aggregate,
 						feature_v2.SystemResetEventType,
@@ -147,10 +135,6 @@ func TestQueries_GetSystemFeatures(t *testing.T) {
 					Level: feature.LevelUnspecified,
 					Value: false,
 				},
-				Actions: FeatureSource[bool]{
-					Level: feature.LevelUnspecified,
-					Value: false,
-				},
 			},
 		},
 		{
@@ -173,10 +157,6 @@ func TestQueries_GetSystemFeatures(t *testing.T) {
 						context.Background(), aggregate,
 						feature_v2.SystemUserSchemaEventType, false,
 					)),
-					eventFromEventPusher(feature_v2.NewSetEvent(
-						context.Background(), aggregate,
-						feature_v2.SystemActionsEventType, false,
-					)),
 					eventFromEventPusher(feature_v2.NewResetEvent(
 						context.Background(), aggregate,
 						feature_v2.SystemResetEventType,
@@ -207,10 +187,6 @@ func TestQueries_GetSystemFeatures(t *testing.T) {
 					Level: feature.LevelUnspecified,
 					Value: false,
 				},
-				Actions: FeatureSource[bool]{
-					Level: feature.LevelUnspecified,
-					Value: false,
-				},
 			},
 		},
 	}