Update GitHub Actions workflows. (#219) #97

Job	Run time
prerequisites	58s
lint / lint	36s
generate_coverage_data	48s
build_sdk (nodejs)	1m 26s
build_sdk (python)	1m 25s
build_sdk (dotnet)	1m 25s
build_sdk (go)	2m 1s
build_sdk (java)	1m 41s
test (nodejs)	2m 47s
test (python)	3m 19s
test (dotnet)	2m 14s
test (go)	2m 41s
test (java)	2m 59s
publish	6m 26s
publish_sdk	4m 6s
Tag release if labeled as needs-release	5s
	34m 57s

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