Revert "DEV: FloatKit (#23312)" (#23540)

This reverts commit abcdd8d367e8db430119f847f029e9cc94e62cb6.

plugins/chat/spec/system/react_to_message_spec.rb

@@ -166,6 +166,9 @@ RSpec.describe "React to message", type: :system do
         channel.click_reaction(message_1, "female_detective")
 
         expect(channel).to have_reaction(message_1, "female_detective", "1")
+        expect(
+          channel.find_reaction(message_1, "female_detective")["data-tippy-content"],
+        ).to include(other_user.username)
       end
     end
   end