## What this PR does
Fix build error in `pkg/generated/applyconfiguration/utils.go` caused by
a reference to `testing.TypeConverter` which was removed in client-go
v0.34.1.
The root cause was that `hack/update-codegen.sh` called `gen_helpers`
and
`gen_openapi` but never called `gen_client`, so the applyconfiguration
code
was never regenerated after the client-go upgrade.
Changes:
- Fix `THIS_PKG` from `k8s.io/sample-apiserver` template leftover to
correct module path
- Add `kube::codegen::gen_client` call with `--with-applyconfig` flag
- Regenerate applyconfiguration (now uses `managedfields.TypeConverter`)
- Add tests for `ForKind` and `NewTypeConverter` functions
### Release note
```release-note
[maintenance] Regenerate applyconfiguration code for client-go v0.34.1 compatibility
```
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Documentation**
* Updated backup class definitions example to reference MariaDB instead
of MySQL.
* **Chores**
* Updated code generation tooling and module dependencies to support
enhanced functionality.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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