Use `traits; test for` mailingLists` #39

Job	Run time
Browser Destination Bundle QA (18.x)	7m 4s
Lint (18.x)	3m 33s
Snyk (18.x)	1m 6s
Browser tests: actions-core (18.x)	1m 51s
Validate (18.x)	3m 28s
Unit tests (18.x)	3m 16s
	20m 18s

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