CE upstream - Saturday

Closes gitlab-ce#36970 and gitlab-qa#122

See merge request gitlab-org/gitlab-ee!3879

Adjust content width for User Settings, Pipeline quota

See merge request gitlab-org/gitlab-ee!3895

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Port of 40780-choose-file to EE

See merge request gitlab-org/gitlab-ee!3886

Correct GitLab Slack Application example on landing page

See merge request gitlab-org/gitlab-ee!3464

Correct add_to_slack_data docs_path for gitlab slack application landing

See merge request gitlab-org/gitlab-ee!3465

Port of 38869-milestone-select to EE

See merge request gitlab-org/gitlab-ee!3874

Make scoped issue board specs more reliable

Closes #4440

See merge request gitlab-org/gitlab-ee!3892

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Table flip quick action docs

See merge request gitlab-org/gitlab-ee!3821

* ee/master:
  Merge branch 'dz-fix-seed-fu' into 'master'
  Merge branch 'fix_db_fixtures_06_teams' into 'master'
  Update CHANGELOG.md for 10.3.1
  Update CHANGELOG-EE.md for 10.3.1-ee
  Replace '.team << [user, role]' with 'add_role(user)' in specs

Explictly require Gitlab::Utils in ProjectFeaturesCompatibility

Closes #41390

See merge request gitlab-org/gitlab-ce!16107

Fix Gitlab::Access.values to Gitlab::Access.sym_options at 06_teams on development db fixtures

See merge request gitlab-org/gitlab-ce!16144

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According to:
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3842

See:
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3879#note_52648241