Update GitHub Actions workflows. (#472) #162

Job	Run time
prerequisites	2m 7s
lint / lint	27s
build_sdk (nodejs)	1m 58s
build_sdk (python)	1m 47s
generate_coverage_data	1m 31s
build_sdk (dotnet)	1m 30s
build_sdk (go)	2m 7s
build_sdk (java)	1m 26s
test (nodejs)	3m 47s
test (python)	3m 34s
test (dotnet)	3m 18s
test (go)	2m 52s
test (java)	2m 36s
publish	12m 17s
publish_sdk	3m 20s
Tag release if labeled as needs-release	3s
	44m 40s

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