refactor(api): keep each app's kind without the apimachinery fork - #4472

…hinery fork (#4473)

## What this PR does

This moves the root module's `k8s.io/*` from v0.35 to v0.37.1 and
controller-runtime from v0.23 to v0.25.1, and drops the
`k8s.io/apimachinery` fork on the way. Supersedes #3001, #4467 and
#4472; those were a stack of the same commits.

The four commits are meant to be read one by one, and each builds and
passes the tests on its own:

1. **Plain watches stop getting the initial-events-end bookmark.** The
apiserver defaults `sendInitialEvents=true` onto any watch with an empty
or `0` resourceVersion and leaves bookmarks off, and our aggregated
storages took that flag alone as a WatchList request. From
`k8s.io/apiserver` v0.36 the watch handler compiled into cozystack-api
panics on that bookmark, so `kubectl get -w` on any cozystack-api
resource would die after the bump. The marker now needs both flags, the
same condition the watch cache uses. There are tests per storage and one
through the real handler chain.
2. **The apimachinery fork goes.** Every apps kind shares the
`Application` Go type, and stock `Scheme.ConvertToVersion` picks the
first kind registered for it. The fork patched that; the apps group now
encodes through a serializer that keeps the kind the object carries. A
handler-chain test covers create, get, list, update, watch, apply and
table for two kinds and fails without it.
3. **MutatingAdmissionPolicy stays out of admission.** From v0.36 the
plugin is on by default and refuses every write until it has synced
`mutatingadmissionpolicies`, which cozystack-api has no RBAC to list and
which clusters before 1.36 do not serve. Without this, every create,
update and delete would fail after the bump. It is also re-applied in
`Complete`, since `--disable-admission-plugins` replaces the list.
4. **The bump itself**, with the regenerated clients, openapi and
strategy CRDs.

Commits 2 and 4 are where the review effort goes; 1 and 3 are small.

Known changes in behaviour:

- Without the fork, the row objects of a Table requested with
`includeObject=Object` carry the first registered app kind. kubectl asks
for that only with `--sort-by`, and it sorts on fields, not on the kind.
Nothing at this layer can fix it, because the handler converts through
`APIGroupInfo.Scheme`, a concrete `*runtime.Scheme`. Admission webhooks
and ValidatingAdmissionPolicy still see the right kind.
- The alpha PodSpec field `workloadRef` became `schedulingGroup`
upstream. Once the new strategy CRDs are applied, the apiserver prunes
`workloadRef` from stored strategies it serves, and their next write
erases it. It only ever worked behind an alpha feature gate.

The branch is rebased onto the Renovate rollup (#4447), with `go mod
tidy` and codegen rerun on top of it.

### Screenshots

No UI changes.

### Downstream repositories

- [x] No downstream repository is affected by this change
- [ ] [cozystack/website](https://github.com/cozystack/website) -
follow-up:
- [ ]
[cozystack/terraform-provider-cozystack](https://github.com/cozystack/terraform-provider-cozystack)
- follow-up:
- [ ]
[cozystack/ansible-cozystack](https://github.com/cozystack/ansible-cozystack)
- follow-up:
- [ ] [cozystack/ccp](https://github.com/cozystack/ccp) - follow-up:
- [ ] [cozystack/talm](https://github.com/cozystack/talm) - follow-up:
- [ ] [cozystack/cozyhr](https://github.com/cozystack/cozyhr) -
follow-up:
- [ ] [cozystack/cozy-proxy](https://github.com/cozystack/cozy-proxy) -
follow-up:
- [ ]
[cozystack/cozystack-telemetry-server](https://github.com/cozystack/cozystack-telemetry-server)
- follow-up:
- [ ]
[cozystack/external-apps-example](https://github.com/cozystack/external-apps-example)
- follow-up:
- [ ] [cozystack/examples](https://github.com/cozystack/examples) -
follow-up:
- [ ] [cozystack/community](https://github.com/cozystack/community) -
follow-up:

### Release note

```release-note
chore(deps): cozystack-api and the controllers build against the Kubernetes 1.37 libraries without the apimachinery fork. Plain watches no longer receive the WatchList initial-events-end bookmark, and objects in Table rows requested with includeObject=Object may carry another app's kind.
```


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

* **New Features**
* Application API responses now preserve the requested resource kind
across operations, including lists and watches.
* Backup strategy resources support additional Kubernetes pod settings,
including probe protocols, volume ownership options, and scheduling
groups.
* Backup strategy schemas include updated Kubernetes pod fields and
descriptions.
* **Bug Fixes**
* Initial-event watch bookmarks are sent only when requested; plain
watches continue without an ending bookmark.
* Mutating Admission Policy is disabled by default, including when
admission plugin options are customized.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->