Transient spec failures with spec/features/notes_on_personal_snippets_spec.rb

It looks like there is a timing issue where the edited note could show up 2 minutes after the edit:

https://gitlab.com/gitlab-org/gitlab-ee/builds/15794648

Note that this particular error happened on EE and MySQL; not sure if it's limited to that:

  2) Comments on personal snippets when editing a note changes the text
     Failure/Error: expect(find('.note_edited_ago').text).to match(/less than a minute ago/)

       expected "2 minutes ago" to match /less than a minute ago/
       Diff:
       @@ -1,2 +1,2 @@
       -/less than a minute ago/
       +"2 minutes ago"
     # ./spec/features/snippets/notes_on_personal_snippets_spec.rb:83:in `block (4 levels) in <top (required)>'
     # ./spec/features/snippets/notes_on_personal_snippets_spec.rb:80:in `block (3 levels) in <top (required)>'
     # ./spec/spec_helper.rb:82:in `block (2 levels) in <top (required)>'

/cc: @jarka

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11160

assigned to @lbennett

mentioned in merge request !11160 (merged)

closed via merge request !11160 (merged)

mentioned in commit 3d6086d0