✨ feat: add support for custom labels on leader election leases ✨

[DerekFrank]

This PR makes two changes:

• Refactors leader_election.go to not use NewWithKubeConfig() and instead perform the timeout calculation itself
• Adds a new option to managers to allow users to set custom labels that will be set on the lease when it changes owner (solves Leverage label functionality for leader election #3216)

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[kmala]

/ok-to-test

[alvaroaleman]

What does this have to do with the rest of the PR?

[DerekFrank]

This lets controllers that have RenewDeadline set also use the label functionality, because NewWithKubeConfig() doesn't allow one to set labels. If we don't make this change then users can either use RenewDeadline or LeaderLabels. This change lets them use both. If you'd prefer, I can cut a PR to client-go to create a NewWithKubeConfigAndLabels() function so we can keep both paths, but this change seems cleaner overall

[k8s-ci-robot]

LGTM label has been added.

Details

Git tree hash: 390d4b14872d16b6383420dbee0d9dbfc2297627

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, DerekFrank

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Needs approval from an approver in each of these files:

• OWNERS [alvaroaleman]

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[alvaroaleman]

/hold

[alvaroaleman]

/hold cancel

[sbueringer]

Thx!

/lgtm