⚠️ Migrate controllers and types to CAPI v1beta2 conditions

[bnallapeta]

What this PR does / why we need it:
This PR completes the migration to Cluster API v1beta2 conditions contract by updating all controllers, service layer, and tests to use the new conditions API.

minor additional change: all generated code updated to 2026 copyright year.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #2942 part of #2895

Special notes for your reviewer:

• PR # 4 as per ✨ Implement CAPI v1beta2 contract support with api/v1beta2 #2895 plan
• The migration maintains backward compatibility for v1alpha1 types (e.g., OpenStackServer.Status.Ready still set for predicates)
• The v1beta1 types remain as conversion hub (storage version) until full migration complete
• Once the first 3 PRs are merged, I will then do the conversion changes.

/hold

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[bnallapeta]

/test pull-cluster-api-provider-openstack-e2e-test

[k8s-ci-robot]

@bnallapeta: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cluster-api-provider-openstack-e2e-test	ea2642d	link	true	/test pull-cluster-api-provider-openstack-e2e-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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