region scatter client: retry scatter regions when finished percentage is not 100.

[Leavrth]

This PR is cherry-picked from #60315

What problem does this PR solve?

Issue Number: ref #60077

Problem Summary:

What changed and how does it work?

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

[tiprow]

Hi @Leavrth. Thanks for your PR.

PRs from untrusted users cannot be marked as trusted with /ok-to-test in this repo meaning untrusted PR authors can never trigger tests themselves. Collaborators can still trigger tests on the PR using /test all.

I understand the commands that are listed here.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[GMHDBJD]

LGTM

[codecov]

Codecov Report

❌ Patch coverage is 63.15789% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.7031%. Comparing base (de5c553) to head (9f3a153).
⚠️ Report is 26 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #64884        +/-   ##
================================================
+ Coverage   74.6926%   74.7031%   +0.0105%     
================================================
  Files          1891       1891                
  Lines        515988     515982         -6     
================================================
+ Hits         385405     385455        +50     
+ Misses       106747     106687        -60     
- Partials      23836      23840         +4     

Flag	Coverage Δ
integration	48.1156% <63.1578%> (-0.0481%)	⬇️

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	62.8272% <63.1578%> (+0.1489%)	⬆️

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BornChanger, GMHDBJD

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [BornChanger,GMHDBJD]
• br/OWNERS [BornChanger]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-12-05 11:35:26.37221432 +0000 UTC m=+608871.185991893: ☑️ agreed by GMHDBJD.
• 2025-12-05 12:26:41.132687012 +0000 UTC m=+611945.946464584: ☑️ agreed by BornChanger.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #64885.
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: #65000.
But this PR has conflicts, please resolve them!