Update GitHub Actions workflows. (#303) #130

Job	Run time
prerequisites	2m 19s
lint / lint	4m 42s
generate_coverage_data	1m 55s
build_sdk (nodejs)	1m 37s
build_sdk (python)	1m 57s
build_sdk (dotnet)	1m 40s
build_sdk (go)	1m 45s
build_sdk (java)	1m 53s
test (nodejs)	2m 48s
test (python)	3m 4s
test (dotnet)	2m 27s
test (go)	3m 54s
test (java)	2m 14s
publish	9m 1s
publish_sdk	2m 46s
Tag release if labeled as needs-release	5s
	44m 7s

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