statistics: delete cluster status metrics on store deletion (#9945)

[ti-chi-bot]

This is an automated cherry-pick of #9945

What problem does this PR solve?

Issue Number: Close #9942

What is changed and how does it work?

Due to adding store label in #9898, we need to delete the related metrics on store deleting, otherwise it will retain forever.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

1. scale-in one tikv
2. pd-ctl store remove-tombstone

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.

To merge this cherry pick:

1. It must be LGTMed and approved by the reviewers firstly.
2. For pull requests to TiDB-x branches, it must have no failed tests.
3. AFTER it has lgtm and approved labels, please wait for the cherry-pick merging approval from triage owners.

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[ti-chi-bot]

@okJiang This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign husharp for approval. For more information see the Code Review Process.
Please ensure that each of them provides their approval before proceeding.

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[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
pull-build-release-8.1	c099589	link	true	/test pull-build-release-8.1

Full PR test history. Your PR dashboard.

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