Add social proof to suggested follows (#4602)

* replace unused `followers` prop with social proof

* Introduce 'minimal' version

* Gate social proof one explore page, fix space if no desc

* Use smaller avis for minimal

---------

Co-authored-by: Eric Bailey <git@esb.lol>

src/lib/statsig/gates.ts

@@ -1,6 +1,7 @@
 export type Gate =
   // Keep this alphabetic please.
   | 'debug_show_feedcontext'
+  | 'explore_page_profile_card_social_proof'
   | 'native_pwi_disabled'
   | 'new_user_guided_tour'
   | 'new_user_progress_guide'