fix(fluxcd): use GA API versions in reconcile kind_map (v2 / v1)

[ayoubil]

Closes #5394 (partial — see scope note below).

The FluxCD provider's reconcile_resource path uses a hard-coded kind_map that still points at pre-GA API versions:

"HelmRelease":   ("helm.toolkit.fluxcd.io",   "v2beta1", "helmreleases"),
"Kustomization": ("kustomize.toolkit.fluxcd.io", "v1beta2", "kustomizations"),
"GitRepository": ("source.toolkit.fluxcd.io",   "v1beta2", "gitrepositories"),
"OCIRepository": ("source.toolkit.fluxcd.io",   "v1beta2", "ocirepositories"),
"HelmRepository":("source.toolkit.fluxcd.io",   "v1beta2", "helmrepositories"),

These APIs were removed in FluxCD 2.7, when the controllers promoted to GA: helm.toolkit.fluxcd.io/v2, kustomize.toolkit.fluxcd.io/v1, and source.toolkit.fluxcd.io/v1. On a 2.7+ cluster, any Reconcile button click from Keep currently fails with a 404 from the Kubernetes API.

The corresponding __list_helm_releases, __list_kustomizations, __list_git_repositories, etc. methods in the same file already query the GA versions, so this PR aligns the reconcile path with how the provider already lists these resources.

Diff

-    "HelmRelease":   ("helm.toolkit.fluxcd.io",   "v2beta1", "helmreleases"),
-    "Kustomization": ("kustomize.toolkit.fluxcd.io", "v1beta2", "kustomizations"),
-    "GitRepository": ("source.toolkit.fluxcd.io",   "v1beta2", "gitrepositories"),
-    "OCIRepository": ("source.toolkit.fluxcd.io",   "v1beta2", "ocirepositories"),
-    "HelmRepository":("source.toolkit.fluxcd.io",   "v1beta2", "helmrepositories"),
+    "HelmRelease":   ("helm.toolkit.fluxcd.io",   "v2", "helmreleases"),
+    "Kustomization": ("kustomize.toolkit.fluxcd.io", "v1", "kustomizations"),
+    "GitRepository": ("source.toolkit.fluxcd.io",   "v1", "gitrepositories"),
+    "OCIRepository": ("source.toolkit.fluxcd.io",   "v1", "ocirepositories"),
+    "HelmRepository":("source.toolkit.fluxcd.io",   "v1", "helmrepositories"),

Scope note (please read before merging)

This PR fixes one concrete consequence of the FluxCD 2.7 GA migration: the Reconcile button → 404 failure path. It does not fully address #5394, which is about HelmReleases not appearing on the topology map. __list_helm_releases already uses v2 so the listing should succeed; the remaining gap likely lives in the v2 schema-shape parsing inside __build_topology (e.g. the spec.chart vs spec.chartRef change). I don't have a 2.7 cluster handy to verify that side.

If you'd prefer to keep #5394 open for the topology-display work, please change the keyword to "Relates to #5394" (or just reopen the issue after merge) — happy either way.

Compatibility

For users on FluxCD < 2.7 the old beta APIs were already deprecated and removed in newer cluster versions. If a backwards-compatible reconcile is desired, the same probing pattern used elsewhere in the file (try v2, fall back to v2beta2/v2beta1) could be added — let me know if that's preferred and I'll iterate.