Add EWS build-step to run build.webkit.org new unit-tests (in Services-EWS). These unit-tests were added in r270354.
Created attachment 415419 [details] Patch
<rdar://problem/72151886>
Committed r272655: <https://commits.webkit.org/r272655> All reviewed patches have been landed. Closing bug and clearing flags on attachment 415419 [details].