Update GitHub Actions workflows. (#435) #151

Job	Run time
prerequisites	3m 40s
lint / lint	28s
generate_coverage_data	2m 31s
build_sdk (nodejs)	2m 4s
build_sdk (python)	2m 20s
build_sdk (dotnet)	1m 41s
build_sdk (go)	2m 10s
build_sdk (java)	1m 50s
test (nodejs)	3m 5s
test (python)	3m 9s
test (dotnet)	3m 3s
test (go)	3m 31s
test (java)	2m 43s
publish	9m 53s
publish_sdk	3m 27s
Tag release if labeled as needs-release	5s
	45m 40s

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