[ux] add sky jobs launch --fast #17580

Job	Run time
python-test (3.8, tests/unit_tests)	7m 12s
python-test (3.8, tests/test_api.py)	3m 57s
python-test (3.8, tests/test_cli.py)	4m 27s
python-test (3.8, tests/test_config.py)	3m 56s
python-test (3.8, tests/test_global_user_state.py)	4m 33s
python-test (3.8, tests/test_jobs.py)	4m 7s
python-test (3.8, tests/test_list_accelerators.py)	4m 13s
python-test (3.8, tests/test_optimizer_dryruns.py)	5m 27s
python-test (3.8, tests/test_optimizer_random_dag.py)	4m 14s
python-test (3.8, tests/test_storage.py)	3m 51s
python-test (3.8, tests/test_wheels.py)	4m 7s
python-test (3.8, tests/test_jobs_and_serve.py)	3m 51s
python-test (3.8, tests/test_yaml_parser.py)	3m 49s
	57m 44s

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