refactor(controller): generalize Pod status synchronization

[ywExcellent]

Ⅰ. Describe what this PR does

Generalizes Pod status synchronization by replacing the Ready-only boolean with explicit synchronization options.

• Separates Pod identity/IP synchronization from Ready-condition synchronization.
• Adds an optional, backend-provided Pending Ready-condition projection and scoped cleanup for conditions owned by that projection.
• Keeps upgrade resume and recreate paths limited to Pod identity/IP synchronization.

Ⅱ. Does this pull request fix one issue?

NONE

Ⅲ. Describe how to verify it

go test ./pkg/controller/sandbox/core -run 'Test(DefaultSyncStatusFromPodPendingProjection|DefaultSyncStatusFromPodSyncReadyWithoutPodInfo|CommonControl_EnsureSandbox(Running|Updated|Resumed)|PodFailure|EnsureSandboxUpgraded|PerformRecreateUpgrade_ContainerStatuses)' -count=1

Ⅳ. Special notes for reviews

• PendingReadyCondition and OwnsPendingReadyReason provide a generic extension point for backend-specific Pending failures without adding provider dependencies to the common controller.
• Cleanup is limited to the caller-owned Ready reason, preserving unrelated startup failures.

[kruise-bot]

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[codecov]

Codecov Report

❌ Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.09%. Comparing base (0ba722a) to head (62aba48).

Files with missing lines	Patch %	Lines
pkg/controller/sandbox/core/common_control.go	78.57%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #939      +/-   ##
==========================================
- Coverage   83.09%   83.09%   -0.01%     
==========================================
  Files         259      259              
  Lines       22545    22555      +10     
==========================================
+ Hits        18734    18741       +7     
- Misses       3090     3091       +1     
- Partials      721      723       +2     

Flag	Coverage Δ
unittests	83.09% <78.57%> (-0.01%)	⬇️

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