scheduler: skip evict-leader-scheduler when setting schedule deny label (#8303)

[ti-chi-bot]

This is an automated cherry-pick of #8303

What problem does this PR solve?

Issue Number: Close #7853 ref #7300

What is changed and how does it work?

- add a real cluster test to test `skip evict-leader-scheduler when setting schedule deny label`
- add `DeleteStoreLabel` API and `DeleteScheduler` API

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-chi-bot]

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[rleungx]

@okJiang PTAL

[rleungx]

/hold