ddl: Delete TiFlash sync status from etcd when table is truncated or dropped

[CalvinNeo]

Signed-off-by: CalvinNeo [email protected]

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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lcwangchao
• zimulala

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[ti-chi-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/11456e101e13ac3a4c1b276497d70212996c5a53

[CalvinNeo]

/cc @breezewish @crazycs520

[CalvinNeo]

/cc @lcwangchao

[ti-srebot]

cherry pick to release-5.2 in PR #37675

[ti-srebot]

cherry pick to release-5.3 in PR #37677

[ti-srebot]

cherry pick to release-5.4 in PR #37678

[ti-srebot]

cherry pick to release-6.0 in PR #37679

[ti-srebot]

cherry pick to release-6.1 in PR #37680

[ti-srebot]

cherry pick to release-6.2 in PR #37681

[CalvinNeo]

/cherry-pick release-6.1

[ti-chi-bot]

@CalvinNeo: new pull request created: #38268.

In response to this:

/cherry-pick release-6.1

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