Update GitHub Actions workflows. (#187) #83

Job	Run time
prerequisites	1m 26s
lint / lint	38s
build_sdk (nodejs)	1m 40s
generate_coverage_data	1m 1s
build_sdk (python)	1m 44s
build_sdk (dotnet)	1m 48s
build_sdk (go)	2m 7s
build_sdk (java)	1m 28s
test (nodejs)	3m 51s
test (python)	4m 15s
test (dotnet)	3m 45s
test (go)	3m 12s
test (java)	3m 8s
publish	9m 0s
publish_sdk	3m 34s
Tag release if labeled as needs-release	5s
	42m 42s

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