Update GitHub Actions workflows. (#128) #66

Job	Run time
prerequisites	1m 25s
lint / lint	4m 37s
generate_coverage_data	1m 8s
build_sdk (nodejs)	1m 51s
build_sdk (python)	1m 50s
build_sdk (dotnet)	1m 17s
build_sdk (go)	2m 14s
build_sdk (java)	2m 2s
test (nodejs)	2m 58s
test (python)	2m 17s
test (dotnet)	2m 30s
test (go)	3m 3s
test (java)	2m 9s
publish	10m 12s
publish_sdk	3m 29s
Tag release if labeled as needs-release	4s
	43m 6s

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