Update GitHub Actions workflows. (#1388) #336

Job	Run time
prerequisites	6m 34s
build_sdk (nodejs)	2m 58s
build_sdk (python)	2m 46s
generate_coverage_data	9m 28s
build_sdk (dotnet)	3m 4s
build_sdk (go)	4m 41s
build_sdk (java)	3m 2s
test (nodejs)	21m 48s
test (python)	6m 25s
test (dotnet)	6m 49s
test (go)	4m 45s
test (java)	2m 23s
publish	27m 2s
publish_sdk	6m 5s
Tag release if labeled as needs-release	3s
	1h 47m 53s

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