## What this PR does
- Adds a pre-commit hook and a dedicated GitHub Actions workflow that
run `make generate` at the repo root to catch drift in generated API
code (CRDs, DeepCopy, clients, RBAC) before it lands on main.
- Pre-commit hook is scoped to paths that actually affect codegen
(`api/`, `pkg/apis/`, `hack/update-codegen.sh`,
`hack/boilerplate.go.txt`) so unrelated commits are not slowed down.
- CI workflow (`.github/workflows/codegen-drift.yml`) installs Go from
`go.mod`, runs `make generate`, and fails on drift with an error
pointing contributors to the local fix.
- Includes one drift fix the check surfaced: `RestoreJobSpec.Options`
(added in #2437) had no `DeepCopyInto` handling — regenerated.
### Release note
```release-note
ci(api): add pre-commit hook and GitHub Actions workflow that verify generated API code (CRDs, deepcopy, clients, RBAC) is in sync with `make generate`.
```
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Chores**
* Added a CI workflow that checks generated code during PRs and fails
the build if generated artifacts diverge.
* Added a pre-commit hook that runs generation checks locally to prevent
committing outdated generated files.
* Fixed deep-copy behavior for backup restore job specs so nested
options are correctly duplicated.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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