ddl: Delete TiFlash sync status from etcd when table is truncated or dropped (#37184)

[ti-srebot]

cherry-pick #37184 to release-6.0
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/37679

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git push git@github.com:ti-srebot/tidb.git pr/37679:release-6.0-4cb0d1f7a00e

---

Signed-off-by: CalvinNeo calvinneo1995@gmail.com

What problem does this PR solve?

Issue Number: close #37168

Problem Summary:

If a table with TiFlash replica is dropped of truncated, we have to delete its progress in etcd. Otherwise will cause too much obsolette keys in etcd if there are frequent dropping/truncating, which can lead to etcd oom.

What is changed and how it works?

Check List

Tests

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

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

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[ti-chi-bot]

@ti-srebot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-srebot]

/run-all-tests

[xhebox]

close for DMR version