* Fix followers count not being updated when migrating follows

Fixes #19900

* Fix validation error in SynchronizeFeaturedTagsCollectionWorker

Also saves remote user's chosen case for hashtags

* Limit remote featured tags before validation

* Add LIMIT of featured tag to instance API response

* Add featured_tags_collection_url to Account

* Add synchronization of remote featured tags

* Deliver update activity when updating featured tag

* Remove featured_tags_collection_url

* Revert "Add featured_tags_collection_url to Account"

This reverts commit cff349fc27.

* Add hashtag sync from featured collections

* Fix tag name normalize

* Add target option to fetch featured collection

* Refactor fetch_featured_tags_collection_service

* Add LIMIT of featured tag to v1/instance API response