[Core][AWS] Allow assumption of AWS Credentials provided in ECS Containers #14348

Job	Run time
python-test (3.8, tests/unit_tests)	6m 9s
python-test (3.8, tests/test_api.py)	5m 13s
python-test (3.8, tests/test_cli.py)	4m 18s
python-test (3.8, tests/test_config.py)	4m 9s
python-test (3.8, tests/test_global_user_state.py)	3m 49s
python-test (3.8, tests/test_jobs.py)	4m 38s
python-test (3.8, tests/test_list_accelerators.py)	4m 44s
python-test (3.8, tests/test_optimizer_dryruns.py)	5m 42s
python-test (3.8, tests/test_optimizer_random_dag.py)	4m 42s
python-test (3.8, tests/test_storage.py)	3m 52s
python-test (3.8, tests/test_wheels.py)	3m 49s
python-test (3.8, tests/test_spot_serve.py)	4m 16s
python-test (3.8, tests/test_yaml_parser.py)	3m 54s
	59m 15s

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