Update GitHub Actions workflows. (#288) #122

Job	Run time
prerequisites	2m 11s
lint / lint	40s
build_sdk (nodejs)	1m 56s
build_sdk (python)	1m 27s
generate_coverage_data	1m 28s
build_sdk (dotnet)	1m 13s
build_sdk (go)	2m 12s
build_sdk (java)	3m 28s
test (nodejs)	2m 54s
test (python)	3m 25s
test (dotnet)	2m 8s
test (go)	3m 51s
test (java)	1m 59s
publish	8m 51s
publish_sdk	3m 27s
Tag release if labeled as needs-release	7s
	41m 17s

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