add index: mark ErrCompacted from etcd as retryable error

[CbcWestwolf]

What problem does this PR solve?

Issue Number: close #59737

Problem Summary:

See the issue description.

What changed and how does it work?

Mark ErrCompacted from etcd as retryable error

Check List

Tests

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

  • I checked and no code files have been changed.

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

[CbcWestwolf]

/retest

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.4896%. Comparing base (c43df07) to head (df4ed13).
⚠️ Report is 594 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #62794        +/-   ##
================================================
+ Coverage   72.8947%   73.4896%   +0.5949%     
================================================
  Files          1771       1787        +16     
  Lines        486289     497248     +10959     
================================================
+ Hits         354479     365426     +10947     
+ Misses       110165     109789       -376     
- Partials      21645      22033       +388     

Flag	Coverage Δ
integration	42.2635% <0.0000%> (?)
unit	72.2332% <100.0000%> (+0.0361%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.8700% <ø> (ø)
parser	∅ <ø> (∅)
br	46.2327% <ø> (-0.0798%)	⬇️

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[D3Hunter]

i suggest split this into 2, one for bug fix, and another for refactor, we might pick the bug fix back to old version, but the refactor part shouldn't in most cases

[CbcWestwolf]

I just split the original PR into two, another is #62833
PTAL for both @D3Hunter

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, fzzf678

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-08-05 08:55:43.287301979 +0000 UTC m=+344853.430063153: ☑️ agreed by D3Hunter.
• 2025-08-05 09:13:08.264791429 +0000 UTC m=+345898.407552604: ☑️ agreed by fzzf678.

[CbcWestwolf]

/retest

[ti-chi-bot]

@CbcWestwolf: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
non-block/pull-mysql-client-test-next-gen	be33fc3	link	false	/test pull-mysql-client-test-next-gen
non-block/pull-integration-e2e-test-next-gen	be33fc3	link	false	/test pull-integration-e2e-test-next-gen
non-block/pull-mysql-test-next-gen	be33fc3	link	false	/test pull-mysql-test-next-gen
non-block/pull-unit-test-next-gen	df4ed13	link	false	/test pull-unit-test-next-gen

Full PR test history. Your PR dashboard.

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #64755.