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Fix a race condition in SharedInformer

**What this PR does / why we need it**:

This fixes a race condition that can occur in the `sharedIndexInformer`

**Which issue(s) this PR fixes**:
Fixes #59822

**Release note**:

```release-note
Fixed a race condition in k8s.io/client-go/tools/cache.SharedInformer that could violate the sequential delivery guarantee and cause panics on shutdown.
```