Adopt RFC 0018 release branch naming (release-X.Y)

[thomasmaas]

Summary

Updates workflows, composite action, and release docs to use release-X.Y convention (no v prefix) per RFC 0018.

Changes

• release.yaml — add release-[0-9]+.[0-9]+ alongside existing release-v[0-9]+.[0-9]+ (dual patterns)
• automated-release.yaml — PR head branch drops v prefix
• .github/actions/create-release-branch/action.yaml — branch construction drops v prefix
• RELEASE.md — update all examples to release-X.Y

Part of Kuadrant/kuadrant-operator#1981

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 431ed3b4-7402-471f-867c-07000e5cd6c3

📥 Commits

Reviewing files that changed from the base of the PR and between 05c6a24 and d236033.

📒 Files selected for processing (4)

• .github/actions/create-release-branch/action.yaml
• .github/workflows/automated-release.yaml
• .github/workflows/release.yaml
• RELEASE.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch rfc-0018-release-branch-naming

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