Get Jest (JavaScript unit test library) to run in PageTriage continuous integration
Now that https://gerrit.wikimedia.org/r/c/mediawiki/extensions/PageTriage/+/910002 (make jest available for unit tests) is merged.
Related to T334642: Investigate switching Javascript unit tests from QUnit to Jest [12hrs]
The documentation at https://www.mediawiki.org/wiki/Continuous_integration/Tutorials/Adding_a_MediaWiki_extension#Editing_Zuul_configuration may be helpful. Looks like a patch may be needed for integration/config -> zuul/layout.yaml