fix(dataprotection): preserve OneToOne source Pod identity during scale-out restore

[leon-ape]

Backport of #10826 for release-1.1. Related to #10828.

Problem

Scale-out creates one Restore per new Pod. The Restore currently replaces the actual Pod ordinal with the start of its instance-template range, and DP later treats BackupStatusTarget.SelectedTargetPods as an ordinal-indexed array. Kubernetes list order does not provide that contract, so reversed lists, ordinal holes, and multiple templates sharing the same ordinal can select the wrong source Pod or produce an empty restore.

What changed

• Preserve the actual scale-out Pod ordinal when building each per-Pod Restore.
• Resolve OneToOne source Pods by exact workload/template/ordinal identity rather than list position.
• Preserve positional behavior for generic claims-template Restores without KubeBlocks Pod identity labels.
• Apply the same identity mapping to snapshot PVCs and prepare-data Jobs.
• Reuse the workload Pod-name parser for exact template extraction.
• Clarify that RestoreManager.SourceTargetName is a prepareData/scale-out override.

Release adaptation

This is an independent release-1.1 port rather than an automatic cherry-pick because the restore manager, tests, and Ops source-target support differ from main.

Validation

Passed with the repository test wrapper (using the current generated mock overlay because the release branch's generated mock file is incomplete):

• ./pkg/controller/instancetemplate
• ./pkg/dataprotection/restore
• ./pkg/controller/plan
• ./pkg/operations
• git diff --check

[apecloud-bot]

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[codecov]

Codecov Report

❌ Patch coverage is 60.33058% with 48 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.63%. Comparing base (86f6a87) to head (b43dea6).

Files with missing lines	Patch %	Lines
pkg/dataprotection/restore/utils.go	49.18%	21 Missing and 10 partials ⚠️
pkg/dataprotection/restore/manager.go	59.45%	12 Missing and 3 partials ⚠️
pkg/controller/plan/restore.go	75.00%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.1   #10836      +/-   ##
===============================================
+ Coverage        55.57%   55.63%   +0.06%     
===============================================
  Files              550      550              
  Lines            62332    62421      +89     
===============================================
+ Hits             34639    34727      +88     
+ Misses           24388    24380       -8     
- Partials          3305     3314       +9     

Flag	Coverage Δ
unittests	55.63% <60.33%> (+0.06%)	⬆️

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