fix: align instance api pvc labels with instanceset

[leon-ape]

What changed

Instance API PVC creation now merges pod template labels into generated PVCs, matching the existing InstanceSet PVC label behavior.

Why

The InstanceSet path adds template labels to PVCs. The InstanceSet2 + Instance API path already applies template labels to the Instance and Pod, but did not carry those labels into PVCs. That made PVCs miss component identity labels such as app.kubernetes.io/instance and apps.kubeblocks.io/component-name, so volume expansion progress lookup could not discover them by the existing label selector.

This keeps the behavior scoped to template labels and does not copy all Instance object labels to PVCs.
The Instance API PVC identity label apps.kubeblocks.io/instance-name remains owned by the Instance controller so deletion/retention reconciliation can still find the PVCs.

Fix #10576.

Validation

go test ./pkg/controller/instance
go test ./controllers/workloads -run TestAPIs -ginkgo.focus "Instance Controller.*delete - (delete|retain) pvc" -count=1
go test ./controllers/workloads -run TestAPIs -count=1

[apecloud-bot]

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[leon-ape]

/approve

[leon-ape]

/approve

[leon-ape]

/approve

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.79%. Comparing base (27588ee) to head (d11a9de).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/controller/instance/utils.go	75.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10588      +/-   ##
==========================================
+ Coverage   63.74%   63.79%   +0.05%     
==========================================
  Files         519      519              
  Lines       62848    62859      +11     
==========================================
+ Hits        40060    40100      +40     
+ Misses      19178    19155      -23     
+ Partials     3610     3604       -6     

Flag	Coverage Δ
unittests	63.79% <75.00%> (+0.05%)	⬆️

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[apecloud-bot]

/cherry-pick release-1.1

[apecloud-bot]

🤖 says: Error cherry-picking.

Auto-merging pkg/controller/instance/utils.go
Auto-merging pkg/controller/instance/utils_test.go
CONFLICT (content): Merge conflict in pkg/controller/instance/utils_test.go
error: could not apply 100e747... fix: align instance api pvc labels with instanceset (#10588)
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/28992267478