Add watch verb for storageclasses (#266)

this PR fixes the errors:

```
E0924 11:31:59.069472       1 reflector.go:150] pkg/mod/k8s.io/client-go@v0.30.2/tools/cache/reflector.go:232: Failed to watch *v1.StorageClass: unknown (get storageclasses.storage.k8s.io)
E0924 11:32:57.379956       1 reflector.go:150] pkg/mod/k8s.io/client-go@v0.30.2/tools/cache/reflector.go:232: Failed to watch *v1.StorageClass: unknown (get storageclasses.storage.k8s.io)
E0924 11:33:50.776342       1 reflector.go:150] pkg/mod/k8s.io/client-go@v0.30.2/tools/cache/reflector.go:232: Failed to watch *v1.StorageClass: unknown (get storageclasses.storage.k8s.io)
E0924 11:34:21.872401       1 reflector.go:150] pkg/mod/k8s.io/client-go@v0.30.2/tools/cache/reflector.go:232: Failed to watch *v1.StorageClass: unknown (get storageclasses.storage.k8s.io)
```

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Enhanced role permissions to include the ability to monitor changes to
resources in real-time by adding the `watch` verb.
- **Bug Fixes**
- Improved resource management capabilities for the
`EtcdClusterReconciler` by updating permissions to allow watching of
storage classes.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: kvaps