fix(cli): accept active sessions autoscaling metric

[cursor]

Summary

• expose the SDK's new active_sessions autoscaling metric in beta endpoint deploy/update CLI payload building
• document the metric in deploy help
• add focused builder and CLI request serialization tests

Tests

• python3 -m pytest tests/cli/test_build_autoscaling.py tests/cli/test_beta_endpoints.py::TestBetaEndpointsDeploy::test_deploy_accepts_active_sessions_scaling_metric tests/cli/test_beta_endpoints_update.py::TestBetaEndpointsUpdate::test_update_accepts_active_sessions_scaling_metric
• python3 -m ruff check src/together/lib/cli/api/beta/endpoints/_utils/_build_autoscaling.py src/together/lib/cli/api/beta/endpoints/deploy.py tests/cli/test_build_autoscaling.py tests/cli/test_beta_endpoints.py tests/cli/test_beta_endpoints_update.py

  

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