Following T245860 and T245865 the "repository definitions" concept and the related RepositoryDefinitions class are no longer used in Wikibase.
- Remove repository definitions from DataAccessSnakFormatterOutputFormatTest: https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Wikibase/+/574183
- Remove repository definitions from UsageTrackingIntegrationTest: https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Wikibase/+/574185
- Remove WikibaseClient::getRepositoryDefinitions:
- Remove repository definitions from WikibaseRepo: https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Wikibase/+/574091
- Remove RepositoryDefinitions class: https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Wikibase/+/574187