tests

chore: Refactor Github Action per b/485167538 #5922

Job	Run time
unit tests (3.14)	1m 16s
integration tests (windows-latest, 3.14)	2m 8s
unit tests (3.10)	1m 8s
integration tests (ubuntu-latest, 3.14)	1m 13s
integration tests (ubuntu-latest, 3.10)	1m 28s
integration tests (macos-latest, 3.10)	2m 45s
integration tests (windows-latest, 3.10)	1m 55s
integration tests (macos-latest, 3.14)	1m 32s
	13m 25s

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