feat(cli): add remediation list filters

[cursor]

Summary

• add repeatable --mode, --state, and --trigger filters to tg beta clusters remediations list
• map short CLI filter values to the SDK remediation enum values
• show remediation trigger in the list table and document filtered list usage

Tests

• .venv/bin/python -m pytest tests/cli/test_beta_clusters.py -q
• .venv/bin/python -m ruff check src/together/lib/cli/api/beta/clusters/remediations/list.py src/together/lib/cli/utils/_help_examples.py tests/cli/test_beta_clusters.py

Target base: next