br: add retry for check multi ingest (#27774)

[ti-srebot]

cherry-pick #27774 to release-5.2
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/27826

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/tidb.git pr/27826:release-5.2-8a7bd559074d

---

What problem does this PR solve?

Do not run multi ingest check if the store is not online.

What is changed and how it works?

When do check tikv multi ingest support:

• skip check offline stores
• Add retry for each store if meets error
• Fall back to not support instead of return error if all retry failed and the cluster doesn't contains tiflash.

Check List

Tests

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

Side effects

Documentation

Release note

Do not check multi-ingest when store is offline.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• glorv
• kennytm

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[ti-srebot]

/run-all-tests

[ti-srebot]

@glorv you're already a collaborator in bot's repo.

[glorv]

/merge

[ti-chi-bot]

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

Commit hash: 22adf8f

[glorv]

@zhouqiang-cl PTAL

[ti-chi-bot]

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