*: make TestStores stable

[rleungx]

What problem does this PR solve?

Issue Number: Close #7954.

What is changed and how does it work?

2024-03-20T07:59:25.9421434Z [2024/03/20 07:58:57.926 +00:00] [WARN] [cluster.go:1495] ["store has been Tombstone"] [store-id=6] [store-address=tikv6] [state=Offline] [physically-destroyed=false]
2024-03-20T07:59:25.9423334Z [2024/03/20 07:58:57.931 +00:00] [INFO] [cluster.go:2225] ["store limit removed"] [store-id=6]

store 6 becomes tombstone.

Check List

Tests

• Unit test

Release note

None.

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[REVIEW NOTIFICATION]

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• lhy1024
• nolouch

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[nolouch]

/merge

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/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 2193e3c

[ti-chi-bot]

@rleungx: Your PR was out of date, I have automatically updated it for you.

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