add leader election timeouts and durations to available parameters

[lhw]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind flake

/kind feature

What this PR does / why we need it:

Add the options to modify the lease duration and election timeouts for kube-controller-manager and kube-scheduler in case there are network issues or slowdowns on the management plane.

Which issue(s) this PR fixes:
Fixes #6420

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

Hi @lhw. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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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[floryut]

@lhw Thank you for the PR, could you please sign CLA ?
/ok-to-test

[lhw]

Company already signed the CLA and I should be on the list. We are currently investigating.

[floryut]

Company already signed the CLA and I should be on the list. We are currently investigating.

Same for this one I guess ?

[oomichi]

/check-cla

[lhw]

I poked the manager again. Hoping for a quick reply this time.

[lhw]

Finally

[floryut]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, lhw

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[EppO]

/lgtm