From https://gitlab.com/gitlab-org/gitlab-ce/issues/36760

Was reverted in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/14373

Add GKE, Login - HTML & CSS
Cluster details - HTML & CSS

Finishes tabs & table
Updates e2e tests

Navigating to the "Members" section of a project would omit the
relative URL root path. Fix the redirection and eliminate the
need for a redirection in the first place.

Fix other redirections failing to work with relative roots

Fix fixture

Adds new line at the end of files

This only appears when in the collapsed sidebar. If the sidebar is expanded, then these items are hidden & no fly-out navigation is displayed.

Closes #36294

In this instance its subgroups, and given we can't deploy it, we
shouldn't allow it to be shown.

Fixes gitlab-org/gitlab-ce#34864

Closes #35658

Every project page displays a navigation menu that in turn displays the
number of open issues and merge requests. This means that for every
project page we run two COUNT(*) queries, each taking up roughly 30
milliseconds on GitLab.com. By caching these numbers and refreshing them
whenever necessary we can reduce loading times of all these pages by up
to roughly 60 milliseconds.

The number of open issues does not include confidential issues. This is
a trade-off to keep the code simple and to ensure refreshing the data
only needs 2 COUNT(*) queries instead of 3. A downside is that if a
project only has 5 confidential issues the counter will be set to 0.

Because we now have 3 similar counting service classes the code
previously used in Projects::ForksCountService has mostly been moved to
Projects::CountService, which in turn is reused by the various service
classes.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/36622

fixed weird dropdown items in issues when on merge request page