scheduler: add test for creating evict-leader-scheduler twice (#8757)

[ti-chi-bot]

This is an automated cherry-pick of #8757

What problem does this PR solve?

Issue Number: Close #8756

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test

Release note

None.

[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci/build	9f97680	link	true	/test build

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[lhy1024]

duplicated