Update GitHub Actions workflows. (#409) #174

Job	Run time
prerequisites	1m 29s
generate_coverage_data	1m 36s
build_sdk (nodejs)	2m 10s
build_sdk (python)	2m 1s
build_sdk (dotnet)	2m 33s
build_sdk (go)	3m 14s
build_sdk (java)	2m 11s
test (nodejs)	10m 3s
test (python)	1m 44s
test (dotnet)	1m 58s
test (go)	2m 8s
test (java)	1m 45s
publish	11m 13s
publish_sdk	3m 36s
Tag release if labeled as needs-release	5s
	47m 46s

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