Hide jump to next discussion button on commit notes

Closes #22354

CHANGELOG

@@ -54,6 +54,7 @@ v 8.12.0 (unreleased)
   - Rename behaviour to behavior in bug issue template for consistency (ClemMakesApps)
   - Fix bug stopping issue description being scrollable after selecting issue template
   - Remove suggested colors hover underline (ClemMakesApps)
+  - Fix jump to discussion button being displayed on commit notes
   - Shorten task status phrase (ClemMakesApps)
   - Fix project visibility level fields on settings
   - Add hover color to emoji icon (ClemMakesApps)

app/views/discussions/_notes.html.haml

@@ -10,6 +10,7 @@
         .btn-group{ role: "group" }
           = link_to_reply_discussion(discussion, line_type)
         = render "discussions/resolve_all", discussion: discussion
+        - if discussion.for_merge_request?
           = render "discussions/jump_to_next", discussion: discussion
     - else
       = link_to_reply_discussion(discussion)