Update GitHub Actions workflows. (#322) #120

Job	Run time
prerequisites	1m 28s
lint / lint	40s
build_sdk (nodejs)	1m 48s
generate_coverage_data	1m 10s
build_sdk (python)	1m 54s
build_sdk (dotnet)	1m 46s
build_sdk (go)	1m 59s
build_sdk (java)	1m 37s
test (nodejs)	1m 48s
test (python)	1m 44s
test (dotnet)	1m 27s
test (go)	2m 1s
test (java)	1m 52s
publish	9m 43s
publish_sdk	3m 51s
Tag release if labeled as needs-release	4s
	34m 52s

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