feat(cli): add hidden list/delete aliases for beta endpoints ls/rm (ENG-92294)

[blainekasten]

Summary

• Keep tg beta endpoints ls / rm as the visible commands.
• Accept hidden list (already present) and delete aliases so users coming from other CLI surfaces (list/delete) still work.
• Hide delete from --help the same way list is hidden (show=False).
• Normalize rm to delete in CLI telemetry, matching the existing ls → list and -d → delete mapping.

Fixes ENG-92294.

Test plan

• uv run pytest tests/cli/test_beta_endpoints.py tests/cli/test_beta_endpoints_rm.py tests/unit/test_cli_telemetry.py -n auto
• tg beta endpoints --help shows ls and rm/-d, not list or delete (agent and Rich formatters)
• tg beta endpoints list and tg beta endpoints delete <id> invoke the same handlers as ls / rm

Linear Issue: ENG-92294

  

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