show managed jobs user column in `sky status -u` #20384

Job	Run time
python-test (3.8, tests/unit_tests)	4m 32s
python-test (3.8, tests/test_api.py)	1m 0s
python-test (3.8, tests/test_cli.py)	2m 10s
python-test (3.8, tests/test_config.py)	1m 0s
python-test (3.8, tests/test_global_user_state.py)	52s
python-test (3.8, tests/test_jobs.py)	3m 22s
python-test (3.8, tests/test_list_accelerators.py)	1m 20s
python-test (3.8, tests/test_optimizer_dryruns.py)	7m 43s
python-test (3.8, tests/test_optimizer_random_dag.py)	1m 50s
python-test (3.8, tests/test_storage.py)	49s
python-test (3.8, tests/test_wheels.py)	52s
python-test (3.8, tests/test_jobs_and_serve.py)	53s
python-test (3.8, tests/test_yaml_parser.py)	44s
	27m 7s

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