[chala2001]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Follow-up to #2690. Leader election now records the leader transition count, like client-go does. It's stored as spec.leaseTransitions on a Lease and leaderTransitions on a ConfigMap. The leader keeps the count on renew, and it goes up by one when another candidate takes the lock.

Locks without the field read as 0.

Which issue(s) this PR fixes:

Follow-up to #2690

Special notes for your reviewer:

Sync client only. Happy to do the asyncio one next.

Does this PR introduce a user-facing change?

Leader election now records leader transitions in the lock.

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: chala2001
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[roycaihw]

/assign