test: add sink functionality for idp intents (#9116)

# Which Problems Are Solved

New integration tests can't use command side to simulate successful
intents.

# How the Problems Are Solved

Add endpoints to only in integration tests available sink to create
already successful intents.

# Additional Changes

None

# Additional Context

Closes #8557

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

cmd/start/start.go

@@ -143,10 +143,6 @@ type Server struct {
 func startZitadel(ctx context.Context, config *Config, masterKey string, server chan<- *Server) error {
 	showBasicInformation(config)
 
-	// sink Server is stubbed out in production builds, see function's godoc.
-	closeSink := sink.StartServer()
-	defer closeSink()
-
 	i18n.MustLoadSupportedLanguagesFromDir()
 
 	dbClient, err := database.Connect(config.Database, false)
@@ -254,6 +250,10 @@ func startZitadel(ctx context.Context, config *Config, masterKey string, server
 	}
 	defer commands.Close(ctx) // wait for background jobs
 
+	// sink Server is stubbed out in production builds, see function's godoc.
+	closeSink := sink.StartServer(commands)
+	defer closeSink()
+
 	clock := clockpkg.New()
 	actionsExecutionStdoutEmitter, err := logstore.NewEmitter[*record.ExecutionLog](ctx, clock, &logstore.EmitterConfig{Enabled: config.LogStore.Execution.Stdout.Enabled}, stdout.NewStdoutEmitter[*record.ExecutionLog]())
 	if err != nil {