Update GitHub Actions workflows. (#192) #88

Job	Run time
prerequisites	1m 26s
lint / lint	36s
generate_coverage_data	1m 13s
build_sdk (nodejs)	1m 42s
build_sdk (python)	1m 45s
build_sdk (dotnet)	1m 20s
build_sdk (go)	1m 59s
build_sdk (java)	1m 52s
test (nodejs)	3m 12s
test (python)	3m 3s
test (dotnet)	3m 35s
test (go)	2m 33s
test (java)	2m 31s
publish	9m 3s
publish_sdk	5m 52s
Tag release if labeled as needs-release	14s
	41m 56s

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