[CICD] Simplified workflows, Add lint_check & functional_tests, Switch to FlagCICD metax runner #138

Job	Run time
run_tests / checkout_and_config	7s
run_tests / lint / pylint_check	37s
run_tests / unit_tests (a100) / unit-a100-models	54m 55s
run_tests / unit_tests (a100) / unit-a100-others	2m 29s
run_tests / unit_tests (a100) / unit-a100-distributed	5m 7s
run_tests / unit_tests (a100) / unit-a100-fusions	3m 35s
run_tests / unit_tests (a100) / unit-a100-transformer	5m 31s
run_tests / unit_tests (a100) / unit-a100-tensor_parallel	54m 55s
run_tests / unit_tests (a100) / unit-a100-core	54m 55s
run_tests / unit_tests (a100) / unit-a100-dist_checkpointing	11m 55s
run_tests / unit_tests (a100) / unit-a100-data	3m 11s
run_tests / unit_tests (a100) / unit-a100-pipeline_parallel	54m 55s
run_tests / unit_tests_complete	2s
run_tests / functional_tests_complete	4s
run_tests / functional_tests	0s
run_tests / all_tests_complete	3s
all_tests	2s
	4h 12m 23s

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