Add v1alpha5 and remove alpha12 fields

[gazarenkov]

Description

• Add v1alpha5 version
• remove earlier deprecated fields

Which issue(s) does this PR fix or relate to

https://issues.redhat.com/browse/RHIDP-9950

PR acceptance criteria

• Tests
• Documentation

[github-actions]

⚠️ Files changed in bundle and installer generation!

Those changes to the operator bundle/installer manifests should have been pushed automatically to your PR branch.

NOTE: If the PR checks are stuck after this additional commit, manually close the PR and immediately reopen it to trigger the checks again.

[github-actions]

PR images are available:

1. https://quay.io/rhdh-community/operator:0.9.0-pr-1943-e4e4722
2. https://quay.io/rhdh-community/operator-bundle:0.9.0-pr-1943-e4e4722
3. https://quay.io/rhdh-community/operator-catalog:0.9.0-pr-1943-e4e4722

[github-actions]

PR images are available:

1. https://quay.io/rhdh-community/operator:0.9.0-pr-1943-b6057ff
2. https://quay.io/rhdh-community/operator-bundle:0.9.0-pr-1943-b6057ff
3. https://quay.io/rhdh-community/operator-catalog:0.9.0-pr-1943-b6057ff

[Fortune-Ndlovu]

/lgtm

[openshift-ci]

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[rm3l]

Late to the party, but this is the Kind config API version and should not have changed. The nightly checks seem to be failing due to this: https://github.com/redhat-developer/rhdh-operator/actions/runs/19750250506/job/56591855345

Follow-up PR to revert this: #1948