Update GitHub Actions workflows. (#129) #67

Job	Run time
prerequisites	1m 52s
lint / lint	42s
build_sdk (nodejs)	1m 54s
build_sdk (python)	1m 35s
build_sdk (dotnet)	1m 25s
generate_coverage_data	49s
build_sdk (go)	2m 0s
build_sdk (java)	2m 3s
test (nodejs)	2m 35s
test (python)	2m 24s
test (dotnet)	2m 32s
test (go)	2m 22s
test (java)	2m 27s
publish	8m 15s
publish_sdk	2m 52s
Tag release if labeled as needs-release	10s
	35m 57s

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