Update GitHub Actions workflows. (#311) #137

Job	Run time
prerequisites	1m 7s
lint / lint	43s
generate_coverage_data	1m 1s
build_sdk (nodejs)	2m 4s
build_sdk (python)	1m 51s
build_sdk (dotnet)	1m 27s
build_sdk (go)	1m 42s
build_sdk (java)	1m 43s
test (nodejs)	2m 20s
test (python)	2m 56s
test (dotnet)	1m 38s
test (go)	2m 31s
test (java)	1m 46s
publish	8m 30s
publish_sdk	2m 44s
Tag release if labeled as needs-release	3s
	34m 6s

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