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>
(cherry picked from commit b8ba7bd5ba)

internal/query/instance_features_test.go

@@ -105,10 +105,6 @@ func TestQueries_GetInstanceFeatures(t *testing.T) {
 						ctx, aggregate,
 						feature_v2.InstanceUserSchemaEventType, false,
 					)),
-					eventFromEventPusher(feature_v2.NewSetEvent(
-						ctx, aggregate,
-						feature_v2.InstanceActionsEventType, false,
-					)),
 				),
 			),
 			args: args{true},
@@ -132,10 +128,6 @@ func TestQueries_GetInstanceFeatures(t *testing.T) {
 					Level: feature.LevelInstance,
 					Value: false,
 				},
-				Actions: FeatureSource[bool]{
-					Level: feature.LevelInstance,
-					Value: false,
-				},
 			},
 		},
 		{
@@ -162,10 +154,6 @@ func TestQueries_GetInstanceFeatures(t *testing.T) {
 						ctx, aggregate,
 						feature_v2.InstanceUserSchemaEventType, false,
 					)),
-					eventFromEventPusher(feature_v2.NewSetEvent(
-						ctx, aggregate,
-						feature_v2.InstanceActionsEventType, false,
-					)),
 					eventFromEventPusher(feature_v2.NewResetEvent(
 						ctx, aggregate,
 						feature_v2.InstanceResetEventType,
@@ -197,10 +185,6 @@ func TestQueries_GetInstanceFeatures(t *testing.T) {
 					Level: feature.LevelUnspecified,
 					Value: false,
 				},
-				Actions: FeatureSource[bool]{
-					Level: feature.LevelUnspecified,
-					Value: false,
-				},
 			},
 		},
 		{
@@ -223,10 +207,6 @@ func TestQueries_GetInstanceFeatures(t *testing.T) {
 						ctx, aggregate,
 						feature_v2.InstanceUserSchemaEventType, false,
 					)),
-					eventFromEventPusher(feature_v2.NewSetEvent(
-						ctx, aggregate,
-						feature_v2.InstanceActionsEventType, false,
-					)),
 					eventFromEventPusher(feature_v2.NewResetEvent(
 						ctx, aggregate,
 						feature_v2.InstanceResetEventType,
@@ -258,10 +238,6 @@ func TestQueries_GetInstanceFeatures(t *testing.T) {
 					Level: feature.LevelUnspecified,
 					Value: false,
 				},
-				Actions: FeatureSource[bool]{
-					Level: feature.LevelUnspecified,
-					Value: false,
-				},
 			},
 		},
 	}