✨ MOD: Add a new config in manager.New to set on stopped leading function

[calmkart]

manager.New() method can't set onStoppedLeading function to options, so we can't set some special LeaderCallbacks in controller-runtime New Method to create a manager.

just add a option onStoppedLeading in manager.Options and set it to manager.controllerManager.onStoppedLeading

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @calmkart. Thanks for your PR.

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[troy0820]

/retitle ✨ MOD: Add a new config in manager.New to set on stopped leading function

[alvaroaleman]

You can just run this after the manager ended to achieve the same result or not?

[calmkart]

lost leader is not equal manager ended. so we can't do that in operator's preStop or other hook.

[alvaroaleman]

What is the difference? The manager ends after it lost the leader?