chore: fix to update one pod in a rolling update at a time

[leon-inf]

No description provided.

[apecloud-bot]

Auto Cherry-pick Instructions

Usage:
  - /nopick: Not auto cherry-pick when PR merged.
  - /pick: release-x.x [release-x.x]: Auto cherry-pick to the specified branch when PR merged.

Example:
  - /nopick
  - /pick release-1.0

[leon-inf]

/pick release-1.0

[codecov]

Codecov Report

❌ Patch coverage is 40.74074% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.76%. Comparing base (4de60f2) to head (6a7848e).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/controller/instanceset/reconciler_update.go	40.74%	23 Missing and 9 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9807      +/-   ##
==========================================
+ Coverage   59.57%   59.76%   +0.19%     
==========================================
  Files         551      551              
  Lines       59765    60008     +243     
==========================================
+ Hits        35607    35866     +259     
+ Misses      20912    20901      -11     
+ Partials     3246     3241       -5     

Flag	Coverage Δ
unittests	59.76% <40.74%> (+0.19%)	⬆️

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[leon-inf]

/approve

[apecloud-bot]

/cherry-pick release-1.0

[apecloud-bot]

🤖 says: Error cherry-picking.

Auto-merging controllers/workloads/instanceset_controller_test.go
CONFLICT (content): Merge conflict in controllers/workloads/instanceset_controller_test.go
Auto-merging pkg/controller/instanceset/reconciler_update.go
error: could not apply c620878... chore: fix to update one pod in a rolling update at a time (#9807)
hint: After resolving the conflicts, mark them with
hint: "git add/rm ", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
hint: Disable this message with "git config set advice.mergeConflict false"

[apecloud-bot]

🤖 says: ‼️ cherry pick action failed.
See: https://github.com/apecloud/kubeblocks/actions/runs/18521501218