[DNM] skip evict leader for v7.5.1

[rleungx]

This PR is only used for test purposes.

diff:
https://github.com/tikv/pd/compare/v7.5.1...rleungx:pd:v7.5.1-skip-evict-leader?expand=1

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[ti-chi-bot]

@rleungx: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-integration-realcluster-test	463297b	link	false	/test pull-integration-realcluster-test
idc-jenkins-ci/build	463297b	link	true	/test build

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[ti-chi-bot]

PR needs rebase.

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