test: consolidate state announcement tests with GRASP-01 spec format

Refactor repository state announcement testing to better match GRASP-01
specification requirements:

- Consolidate multiple refs testing into accept_valid_repo_state_announcement
- Remove separate accept_state_announcement_multiple_refs test (redundant)
- Update tag format to match spec: use git reference as tag kind
  Example: ["refs/heads/main", "<commit-sha>"] instead of ["r", "refs/heads/main", "<commit-sha>"]
- Ensure repo announcement (kind 30617) is sent before state announcement
- Test multiple branch refs (main, develop), tag refs (v1.0.0), and HEAD
- Simplify test validation by removing redundant assertions

This approach provides better spec compliance and reduces test redundancy
while maintaining comprehensive coverage of multiple reference scenarios.

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