For both groups_controller and admin/groups_controller

This setting is at the group level only. The default is specified to
be maintainers and owners.

**Specs only**, all failing.

All specs passing

- Change the two existing feature examples that create a subgroup to
  elucidate that the owner is creating the subgroup

- Nest two more specs inside the 'subgroup support' context detailing
  what happens when a maintainer attempts to add a subgroup (one with
  subgroup support, and one without)

Handle trailing slashes when generating issue URLs

See merge request gitlab-org/gitlab-ce!30911

use the property of name_with_namespace instead of name for the new issue form in boards

See merge request gitlab-org/gitlab-ee!14679

use the property of name_with_namespace instead of name for the new issue form in group boards

See merge request gitlab-org/gitlab-ce!30021

add a new attribute for name_with_namespace

prettier the changed code

Add info about mdl to documentation

See merge request gitlab-org/gitlab-ce!30792

Applies to issues_url and new_issue_url

Updates check_mentions_for_xss_spec to use admin token for creating the user

Closes gitlab-org/quality/staging#65

See merge request gitlab-org/gitlab-ce!30943

Documentation for email confirmation signup restriction

Closes #63060

See merge request gitlab-org/gitlab-ce!30968

Document all the available options for SAST

Closes gitlab-ee#10120

See merge request gitlab-org/gitlab-ce!30747

Port all info from:

- security-products/sast/blob/master/docs/README.md
- security-products/sast/blob/master/docs/analyzers.md

Resolve "Update email address on How to reset your root password docs"

Closes #64768

See merge request gitlab-org/gitlab-ce!30926

Fix unordered list spacing (part 2)

See merge request gitlab-org/gitlab-ce!30796

Correct the spacing of unordered markdown lists
in docs, to maintain standards of documentation,
in /user and others.

Standardize page objects use on CE Plan tests

See merge request gitlab-org/gitlab-ce!30962

Wiki Usage Ping for Create SMAU

See merge request gitlab-org/gitlab-ce!30864

This adds a counter to count page creation, which is reflected in the
usage-data we collect.

The number created is stored in Redis, avoiding DB access.

This is a first iteration to address the following issue:
https://gitlab.com/gitlab-org/quality/team-tasks/issues/168

Note: depends on
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/30945