We need to keep the email lookup as we want to fall back to displaying
the gravatar result for a given email if the user does not exist.

Whenever we already deal with a User object, let's use the more specific
method avatar_icon_for_user.

The refs hash is used to determine what branches and tags have a commit
as head in the network graph. The previous implementation depended on
Rugged#references. The problem with this implementation was that it
depended on rugged, but also that it iterated over all references and
thus loading more data than needed if for example the project uses CI/CD
environments, Pipelines, or Merge Requests.

Given only refs are checked the network cares about the GraphHelper#refs
method has no need to reject those, simplifying the method.

Closes gitlab-org/gitaly#880

Fabio authored 7 years ago and Tim Zallmann committed 7 years ago

Resolve "Add a link to documentation on how to get external ip in the Kubernetes cluster details page"

See https://gitlab.com/gitlab-org/gitlab-ce/issues/39118

Conflicts:
	app/views/ci/variables/_form.html.haml
	app/views/ci/variables/_table.html.haml
	ee/app/views/ci/variables/_environment_scope.html.haml
	spec/javascripts/ci_variable_list/ci_variable_list_ee_spec.js
	spec/javascripts/fixtures/projects.rb

- Change button group width on mobile to 100%
- Added scrolling container to activity top area secondary navigation
- Added bottom border to top-area nav-links to separate them from nav-controls

Part of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/4110

Part of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/4110

- Add section headers to project repo buttons
- Add primary button to content to add file when the repository is empty
- Change project removal primary button from project overview to secondary button
- Update headings for better alignment
- Add primary button for readme only user preference

Basically using the new expand_section

Changes the text in the Revert merge request modal: `Start a new merge request with these changes` => `Start a new merge request with the revert changes`.