One of the spec files sets `nil` value for env varialbe
`action_dispatch.request.formats`. Rather than setting `nil` value,
we can delete the `action_dispatch.request.formats` key from `env`
(which should be closer to real use case anyway). The reason is that
in Rails 5, `formats` method does not set default array of formats
if the env key is already set (even if set to `nil`).

Harmonize theme preferences previews

See merge request gitlab-org/gitlab-ce!19916

Resolve "BS4: Mini graph dropdown sometimes open on the top"

Closes #47610

See merge request gitlab-org/gitlab-ce!19912

Resolve "Pipeline dropdown shifts around at smaller screen sizes"

Closes #47068

See merge request gitlab-org/gitlab-ce!19910

Remove small container width

Closes #36439

See merge request gitlab-org/gitlab-ce!19893

Resolve "Wiki git clone holder and dropdown is broken"

Closes #47917

See merge request gitlab-org/gitlab-ce!19913

Enable no-multi-assignment in JS files

See merge request gitlab-org/gitlab-ce!19808

Resolve "Update link in GitLab cluster setup form to say "see pricing""

Closes #45557 and #47431

See merge request gitlab-org/gitlab-ce!19495

Resolve "Misalignment in rows on comparison page"

Closes #47879

See merge request gitlab-org/gitlab-ce!19909

Resolve "Stop horizontal scrolling when clicking on board issue"

Closes #46610

See merge request gitlab-org/gitlab-ce!19722

Merge branch '47975-project-select-dropdown-is-broken-for-group-issues-and-merge-requests' into 'master'

Resolve "Project select dropdown is broken for group issues and merge requests"

Closes #47975

See merge request gitlab-org/gitlab-ce!19906

Remove additional border from the create project page

Closes #47356

See merge request gitlab-org/gitlab-ce!19899

Partially addresses #47006.

Fix alert colors

Closes #47983

See merge request gitlab-org/gitlab-ce!19905

Fix dropdown from the project welcome page moving out of the screen

Closes #47966

See merge request gitlab-org/gitlab-ce!19903

Resolve "Web IDE autocomplete should be disabled in markdown files"

Closes #47796

See merge request gitlab-org/gitlab-ce!19760

Remove pointer events in favor of boundary viewport

Closes #46769

See merge request gitlab-org/gitlab-ce!19875

Resolve "odd numbered list rows have darker bg color?"

Closes #47272

See merge request gitlab-org/gitlab-ce!19896

Improve commit flow in Web IDE

Closes #46122

See merge request gitlab-org/gitlab-ce!19735

CE: Resolve 2 "Extract EE specific files/lines for app/views/shared/issuable"

See merge request gitlab-org/gitlab-ce!19772

Remove FaviconUploader favicon_main version

See merge request gitlab-org/gitlab-ce!19891

Resolve "Prettier seems to ignore the `overrides`"

Closes #44771

See merge request gitlab-org/gitlab-ce!19153

Enable no-restricted-globals in JS files

See merge request gitlab-org/gitlab-ce!19877

CE: Resolve 3 "Extract EE specific files/lines for app/views/shared/issuable"

See merge request gitlab-org/gitlab-ce!19777

Resolve "Long labels names result in overflowing their description block under the Labels page"

Closes #47915

See merge request gitlab-org/gitlab-ce!19868