Change Details

Pending: https://gerrit.wikimedia.org/r/#/c/mediawiki/core/+/597913/ Move `defineTag`, `undefineTag`, and `deleteTagEverywhere` to new `ChangeTagStore` service

Pending: https://gerrit.wikimedia.org/r/#/c/mediawiki/core/+/597913/ Move `defineTag`, `undefineTag`, `deleteTagEverywhere`, and `purgeTagCacheAll` to new `ChangeTagStore` service

Pending: https://gerrit.wikimedia.org/r/#/c/mediawiki/core/+/597913/ Move `defineTag`, `undefineTag`, and `deleteTagEverywhere`ere`, and `purgeTagCacheAll` to new `ChangeTagStore` service