Update GitHub Actions workflows. (#224) #107

Job	Run time
prerequisites	1m 22s
lint / lint	3m 32s
build_sdk (nodejs)	1m 45s
build_sdk (python)	1m 43s
generate_coverage_data	1m 10s
build_sdk (dotnet)	1m 40s
build_sdk (go)	4m 23s
build_sdk (java)	1m 55s
test (nodejs)	3m 58s
test (python)	3m 30s
test (dotnet)	4m 5s
test (go)	3m 30s
test (java)	3m 40s
publish	6m 57s
publish_sdk	2m 54s
Tag release if labeled as needs-release	4s
	46m 8s

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