Update GitHub Actions workflows. (#143) #80

Job	Run time
prerequisites	3m 50s
generate_coverage_data	52s
build_sdk (nodejs)	1m 27s
build_sdk (python)	1m 25s
build_sdk (dotnet)	1m 59s
build_sdk (go)	1m 42s
build_sdk (java)	1m 30s
test (nodejs)	2m 28s
test (python)	2m 21s
test (dotnet)	1m 54s
test (go)	1m 51s
test (java)	1m 55s
publish	6m 50s
publish_sdk	3m 3s
Tag release if labeled as needs-release	9s
	33m 16s

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