chore: migrate provider to crossplane-runtime/v2

[justin-luong]

Migrate the Cloud Foundry provider to crossplane-runtime/v2 v2.2.2.

• Bumped xp-clifford to v0.0.0-20260528123824-27644fae68e8 (v2-migrated)
• Renamed managed.WithExternalConnecter -> WithExternalConnector and ExternalConnecter -> ExternalConnector across all controllers
• Added ProviderConfigKinds.Usage to fix runtime panic in v2 reconciler
• Added documented SA1019 exclusion in .golangci.yml for unavoidable deprecated APIs (LegacyManaged, GetEventRecorderFor) that v2 still requires in public signatures
• Fixed Makefile typo: xpkg.build.crossplane-provider-cloudfoundry -> xpkg.build.provider-cloudfoundry, eliminating "No such image" race on clean builds
• Removed StoreConfig type, CRD, and examples (External Secret Stores feature was dropped in Crossplane v2)
• Regenerated CRDs with controller-gen v0.20.0; publishConnectionDetailsTo schema is no longer emitted (xpv1.PublishConnectionDetailsTo removed in v2)

Potentially Breaking Change: External Secret Stores support removed as crossplane-runtime/v2 no longer provides xpv1.SecretStoreConfig, xpv1.PublishConnectionDetailsTo and the entire ESS reconciler

• Replace publishConnectionDetailsTo: with writeConnectionSecretToRef:
• The StoreConfig CRD is gone; use Kubernetes Secrets + downstream tooling (External Secrets Operator, Vault CSI driver, etc.) for external secret backends.

[SatabdiG]

Given that ESS was alpha, never graduated, required a deliberate multi-step opt-in and was dropped in crossplane-runtime v2 precisely because adoption was negligible —We proceed with a prominent migration note in the release notes and on the community call.