ingest: retry failed regions when batch scatter regions

[GMHDBJD]

What problem does this PR solve?

Issue Number: close https://github.com/pingcap/tidb/issues/60077

Problem Summary:

What changed and how does it work?

• retry failed regions when batch scatter regions
• cherrypick https://github.com/pingcap/tidb/pull/60839

Check List

Tests

• [x] 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

[tiprow[bot]]

Hi @GMHDBJD. Thanks for your PR.

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 84.61538% with 6 lines in your changes missing coverage. Please review.

Project coverage is 75.8085%. Comparing base (f770560) to head (0a83198). Report is 156 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #61722        +/-   ##
================================================
+ Coverage   73.1149%   75.8085%   +2.6935%     
================================================
  Files          1730       1782        +52     
  Lines        481167     500011     +18844     
================================================
+ Hits         351805     379051     +27246     
+ Misses       107842      97946      -9896     
- Partials      21520      23014      +1494     

Flag	Coverage Δ
integration	49.5291% <47.3684%> (?)
unit	73.1016% <84.6153%> (+0.7420%)	:arrow_up:

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Components	Coverage Δ
dumpling	52.7804% <ø> (ø)
parser	∅ <ø> (∅)
br	64.6215% <84.6153%> (+17.6387%)	:arrow_up:

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[GMHDBJD]

/retest

[tiprow[bot]]

@GMHDBJD: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2025-06-19 09:52:59.332993437 +0000 UTC m=+351832.056172418: :ballot_box_with_check: agreed by Benjamin2037.
• 2025-06-20 03:41:00.226545986 +0000 UTC m=+415912.949724992: :ballot_box_with_check: agreed by tangenta.

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bb7133, Benjamin2037, Leavrth, tangenta

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Needs approval from an approver in each of these files:

• ~~OWNERS~~ [Benjamin2037,Leavrth,bb7133,tangenta]
• ~~br/OWNERS~~ [Leavrth]

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[Benjamin2037]

/retest

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #62287. But this PR has conflicts, please resolve them!

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #62288. But this PR has conflicts, please resolve them!