After T363153 we should run the ES phpunit tests in CI in a client only configuration on top of running them with repo (as we currently do).
This already exists for Wikibase, thus we can probably adopt the configuration from there. See Wikibase configurations at:
⇒ https://gerrit.wikimedia.org/r/plugins/gitiles/integration/config/+/refs/heads/master/zuul/layout.yaml#5300
⇒ https://gerrit.wikimedia.org/r/plugins/gitiles/integration/config/+/refs/heads/master/jjb/mediawiki.yaml#1075
⇒ https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/Wikibase/+/refs/heads/master/build/jenkins/mw-apply-wb-settings.sh
AC:
- In CI the EntitySchema phpunit test suite is run in a configuration where WikibaseRepo is not present (or at least $wgEntitySchemaIsRepo is false)