Use principal to classify system workers #31130

Job	Run time
build-docker-image	2m 45s
feature-tests-go / test	3m 7s
feature-tests-go-chasm-scheduler / test	3m 9s
feature-tests-python / test	2m 10s
feature-tests-java / test	2m 27s
feature-tests-ts / test	3m 15s
feature-tests-dotnet / test	2m 0s
feature-tests-ruby / test	1m 10s
Tests Status	4s
	20m 7s

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