Show the preferences cog in reference previews:
{F34052615} {F34052614}
**Requirements**
[x] Cog wheel size/styling should match existing Page Previews (Discussed in {T256504})
[x] Logged-in users: Clicking should send users to the appearance preference tab where Reference Previews can be disabled, matching the behavior of Page Previews. The preferences will be merged into a joint preference, see {T265709}
[] Anonymous users: Clicking should open the merged Previews settings pop-up, edited/created in {T265709}
[] Hide cog wheel on RefPreviews popups on beta feature wikis
**Implementation**
* Add settings to footer of reference previews analog to the [[ https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Popups/+/636710 | settings solution in page previews ]].
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Popups/+/661954