Add developmenty documentation about routing

See merge request gitlab-org/gitlab-ce!28533

Explain and recommend developers to use `/-/` scope for group and
project routes in Rails
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Add benchmark-memory Ruby gem

See merge request gitlab-org/gitlab-ce!28762

Adds a confidence filter to the GSD

See merge request gitlab-org/gitlab-ee!12805

Resolve "Validate k8s credentials provided at cluster creation"

Closes #55447

See merge request gitlab-org/gitlab-ce!27403

Added a changelog entry for the feature

Port of Validate k8s credentials provided at cluster creation

See merge request gitlab-org/gitlab-ee!12226

Added a changelog entry for the feature

Add expand/collapse button to error tracking settings

See merge request gitlab-org/gitlab-ce!28619

Add ability to expand/collapse error tracking settings

Add Object.entries polyfill for IE11 compatibility

See merge request gitlab-org/gitlab-ce!28732

Fix security dashboard errors on IE11

See merge request gitlab-org/gitlab-ee!13319

Be explicit about setting :masked

See merge request gitlab-org/gitlab-ce!28759

Edit Admin Area *Labels* to comply with SSOT guidelines

See merge request gitlab-org/gitlab-ce!28528

Edit admin index to comply with SSOT guidelines

See merge request gitlab-org/gitlab-ce!28569

Update import.md - fix documented mkdir command so it can succeed

See merge request gitlab-org/gitlab-ce!28616

Docs - dedicated GitLab Managed Apps page

See merge request gitlab-org/gitlab-ce!28103

So we can add detailed information, and also point to SSOT

Added Geo troubleshooting instructions

See merge request gitlab-org/gitlab-ce!28491

Added instructions cover all existing error messages from health check
status errors that can appear in the Geo Node admin UI

Update path to Usage Statistics in Admin Settings

See merge request gitlab-org/gitlab-ce!28568

In addition to API, add support for toggling mased on UI too.

(Though fabricate_via_browser_ui is private)

Edit Admin Area's *Health Check* content for SSOT

See merge request gitlab-org/gitlab-ce!28531

Edit License details to comply with SSOT guidelines

See merge request gitlab-org/gitlab-ce!28529