Update GitHub Actions workflows. (#286) #119

Job	Run time
prerequisites	1m 13s
lint / lint	3m 47s
generate_coverage_data	55s
build_sdk (nodejs)	1m 29s
build_sdk (python)	1m 31s
build_sdk (dotnet)	2m 30s
build_sdk (go)	1m 52s
build_sdk (java)	1m 35s
test (nodejs)	3m 44s
test (python)	3m 3s
test (dotnet)	3m 23s
test (go)	3m 38s
test (java)	2m 28s
publish	8m 23s
publish_sdk	3m 0s
Tag release if labeled as needs-release	5s
	42m 36s

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