Update GitHub Actions workflows. (#391) #167

Job	Run time
prerequisites	2m 14s
generate_coverage_data	1m 25s
build_sdk (nodejs)	2m 20s
build_sdk (python)	1m 44s
build_sdk (dotnet)	2m 16s
build_sdk (go)	2m 41s
build_sdk (java)	2m 11s
test (nodejs)	8m 53s
test (python)	2m 17s
test (dotnet)	2m 46s
test (go)	2m 17s
test (java)	2m 31s
publish	8m 42s
publish_sdk	3m 50s
Tag release if labeled as needs-release	3s
	46m 10s

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