fix(nodepodprobe): safely initialize Labels map when patching pod probe status

[vishalmore90]

Ⅰ. Describe what this PR does

This PR fixes a bug in the NodePodProbe controller where it panics with a nil pointer dereference when a PodProbeMarker has a policy that adds labels to a pod, and the target pod has no existing labels (pod.Labels == nil).

The controller safely guarded against nil Annotations, but did not have the same check for Labels. This PR adds the same initialization check for Labels to prevent the panic.

Ⅱ. Does this pull request fix one issue?

fixes #2527

Ⅲ. Describe how to verify it

To reproduce the issue and verify the fix:

1. Create a pod with absolutely no labels.
2. Create a PodProbeMarker targeting this pod (using operator: DoesNotExist for a dummy label) with a MarkerPolicy that adds a label on success.
3. Observe the kruise-manager controller logs. Without this fix, the controller encounters a panic crash-loop. With this fix, the controller applies the labels without issue.

Ⅳ. Special notes for reviews

NONE

[kruise-bot]

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.26%. Comparing base (68dc260) to head (8639c84).

Files with missing lines	Patch %	Lines
...ntroller/nodepodprobe/node_pod_probe_controller.go	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2530      +/-   ##
==========================================
- Coverage   50.31%   50.26%   -0.06%     
==========================================
  Files         325      325              
  Lines       28499    28501       +2     
==========================================
- Hits        14340    14325      -15     
- Misses      12472    12486      +14     
- Partials     1687     1690       +3     

Flag	Coverage Δ
unittests	50.26% <0.00%> (-0.06%)	⬇️

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