Update GitHub Actions workflows. (#351) #127

Job	Run time
prerequisites	2m 7s
generate_coverage_data	1m 53s
build_sdk (nodejs)	1m 55s
build_sdk (python)	2m 1s
build_sdk (dotnet)	2m 20s
build_sdk (go)	2m 34s
build_sdk (java)	1m 57s
test (nodejs)	1m 40s
test (python)	1m 15s
test (dotnet)	1m 32s
test (go)	1m 12s
test (java)	1m 27s
publish	4m 41s
publish_sdk	3m 53s
Tag release if labeled as needs-release	3s
	30m 30s

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