Merge branch '23875-fixup-failing-spec' into 'master'

Prevent a spec from failing in `spec/features/merge_requests/diff_notes_resolve_spec.rb`

## What does this MR do?

Fixes a failing spec in `spec/features/merge_requests/diff_notes_resolve_spec.rb`

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

Tests failing on master. RSpec executes inner `before` blocks after outer `before` blocks, so the second note was being added *after* loading the page, and then being pulled in by running JS on the page, causing intermittent failures if we clicked the resolve button before the note was loaded.

## Screenshots (if relevant)

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG.md) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

Closes #23875

See merge request !7150

spec/features/merge_requests/diff_notes_resolve_spec.rb

@@ -194,12 +194,12 @@ feature 'Diff notes resolve', feature: true, js: true do
     context 'multiple notes' do
       before do
         create(:diff_note_on_merge_request, project: project, noteable: merge_request)
+        visit_merge_request
       end
 
       it 'does not mark discussion as resolved when resolving single note' do
-        page.within '.diff-content .note' do
+        page.first '.diff-content .note' do
           first('.line-resolve-btn').click
-          sleep 1
           expect(first('.line-resolve-btn')['data-original-title']).to eq("Resolved by #{user.name}")
         end
 
@@ -212,7 +212,9 @@ feature 'Diff notes resolve', feature: true, js: true do
 
       it 'resolves discussion' do
         page.all('.note').each do |note|
-          note.find('.line-resolve-btn').click
+          note.all('.line-resolve-btn').each do |button|
+            button.click
+          end
         end
 
         expect(page).to have_content('Resolved by')
@@ -292,7 +294,7 @@ feature 'Diff notes resolve', feature: true, js: true do
           expect(holder).to have_selector('.discussion-next-btn')
         end
       end
-      
+
       it 'displays next discussion even if hidden' do
         page.all('.note-discussion').each do |discussion|
           page.within discussion do