fix: can't save jobs to db when close because of mismatch context Done channels in bridge_core.NewWithContext()

[lyn1505]

A bug in bridge_core.NewWithContext() will cause controller.Close() to never wrap up job pool (this line never finished):

• The context used in controller.cancelFunc (code) is the child of the context passed to Pool (code)
• So, when controller.Close() is called, although controller.cancelFunc() is called (code), context of Pool isn't cancelled --> jobs never get wrapped up and saved

There are the same context mismatches in other places in bridge_core.NewWithContext(), which I don't know what effects it has.