Only check :can_resolve permission if the note is resolvable

Currently this permission check incurs a significant performance hit on loading issues
where it does not make sense to check this permission in the first place.

CHANGELOG

@@ -2,6 +2,7 @@ Please view this file on the master branch, on stable branches it's out of date.
 v 8.12.0 (unreleased)
   - Update the rouge gem to 2.0.6, which adds highlighting support for JSX, Prometheus, and others. !6251
+  - Only check :can_resolve permission if the note is resolvable
   - Add ability to fork to a specific namespace using API. (ritave)
   - Cleanup misalignments in Issue list view !6206
   - Prune events older than 12 months. (ritave)

app/views/projects/notes/_note.html.haml

 - return unless note.author
 - return if note.cross_reference_not_visible_for?(current_user)
-- can_resolve = can?(current_user, :resolve_note, note)
 - note_editable = note_editable?(note)
 %li.timeline-entry{ id: dom_id(note), class: ["note", "note-row-#{note.id}", ('system-note' if note.system)], data: {author_id: note.author.id, editable: note_editable} }
@@ -24,6 +23,8 @@
               %span.note-role.hidden-xs= access
             - if note.resolvable?
+              - can_resolve = can?(current_user, :resolve_note, note)
+
               %resolve-btn{ ":namespace-path" => "'#{note.project.namespace.path}'",
                   ":project-path" => "'#{note.project.path}'",
                   ":discussion-id" => "'#{note.discussion_id}'",