✨ Add installControllers and uninstallControllers for leaderElectionStopping

[ramramu3433]

Summary

At times we faced workspace controller creation stuck at scheduling phase and never recovers, we found that RCA of the issue is that , when the controllers are started using leaderElection, if the leader is lost once, the Queue processing is never restored ,because workqueue depth increases

• initialize informers before starting the controllers and informers ,and stop controllers when the pod is no longer a leader
• reinitialize when the pod is elected as leader
• move the openapi controller to a seperate post hook to avoid stopping when the pod is lost leader election.

Related issue(s)

Fixes #

Release Notes

 Fix sequencing of controllers/informers start and leader election 

[kcp-ci-bot]

Hi @ramramu3433. Thanks for your PR.

I'm waiting for a kcp-dev member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[embik]

/ok-to-test

Please restore the PR description format and give a release note!

[embik]

Thank you for the contribution @ramramu3433! I've left some comments, overall this looks like a very promising approach to resolving the issue at hand.

[ramramu3433]

/test all

[embik]

Code looks good to me now, but please update the PR description before this can be approved and lgtm'd: #3132 (comment).

[embik]

/lgtm

Will leave final approval to others who have reviewed this.

[kcp-ci-bot]

LGTM label has been added.

Git tree hash: 04ca1446bdc0bcd2bbee2e61dc1bb65e8e7548ab

[palnabarun]

/lgtm

[mjudeikis]

/approve

[kcp-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mjudeikis

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