Update GitHub Actions workflows. (#179) #79

Job	Run time
prerequisites	1m 36s
lint / lint	32s
generate_coverage_data	1m 24s
build_sdk (nodejs)	1m 52s
build_sdk (python)	2m 11s
build_sdk (dotnet)	1m 36s
build_sdk (go)	1m 42s
build_sdk (java)	1m 49s
test (nodejs)	5m 33s
test (python)	4m 15s
test (dotnet)	3m 42s
test (go)	3m 50s
test (java)	5m 2s
publish	8m 48s
publish_sdk	3m 18s
Tag release if labeled as needs-release	5s
	47m 15s

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