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/execution/execution.go

@@ -82,11 +82,11 @@ func CallTarget(
 	case domain.TargetTypeCall:
 		return Call(ctx, target.GetEndpoint(), target.GetTimeout(), info.GetHTTPRequestBody(), target.GetSigningKey())
 	case domain.TargetTypeAsync:
-		go func(target Target, info ContextInfoRequest) {
-			if _, err := Call(ctx, target.GetEndpoint(), target.GetTimeout(), info.GetHTTPRequestBody(), target.GetSigningKey()); err != nil {
+		go func(ctx context.Context, target Target, info []byte) {
+			if _, err := Call(ctx, target.GetEndpoint(), target.GetTimeout(), info, target.GetSigningKey()); err != nil {
 				logging.WithFields("target", target.GetTargetID()).OnError(err).Info(err)
 			}
-		}(target, info)
+		}(context.WithoutCancel(ctx), target, info.GetHTTPRequestBody())
 		return nil, nil
 	default:
 		return nil, zerrors.ThrowInternal(nil, "EXEC-auqnansr2m", "Errors.Execution.Unknown")