Update GitHub Actions workflows. (#229) #101

Job	Run time
prerequisites	2m 41s
lint / lint	45s
build_sdk (nodejs)	1m 52s
build_sdk (python)	1m 48s
build_sdk (dotnet)	1m 20s
build_sdk (go)	1m 41s
generate_coverage_data	1m 49s
build_sdk (java)	1m 44s
test (nodejs)	2m 53s
test (python)	2m 39s
test (dotnet)	2m 18s
test (go)	2m 34s
test (java)	2m 10s
publish	7m 58s
publish_sdk	3m 9s
Tag release if labeled as needs-release	4s
	37m 25s

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