This new global setting will allow admins to specify if HTML emails should be sent or not,
this is basically useful when system administrators want to save some disk space by avoiding
emails in HTML format and using only the Plain Text version.

Closes #23150

This prevents leakage of project names on an endpoint which is
unauthenticated and thus open to the world.

The database should not have any soft-deleted groups. Due to a race
condition (soft-delete completes after the hard-delete), soft-deleted
groups were (incorrectly) left in the database, causing issues while
trying to create a new group with the same name.

add pipeline id to merge request metrics table. Also, updated the pipeline worker to populate this field.

Improves documentation

Adds tests

Fix prop validation for objects

Finish tests for environment item

Adds tests for toggle folder function

Environment tests

Adds tests

See https://gitlab.com/gitlab-org/gitlab-ce/issues/24386

   Set request access for projects/groups to false by default.
   Request access implemented in !5286 8.10 was enabled by default.

The AddVisibilityLevelToGroups migration introduced a visibility_level for
namespaces and specified that projects should always have a visibility level
less than or equal to their namespace. However, some invalid rows could have
been created.

This commit introduces a migration that updates the invalid rows, setting the
invalid project to have the same visibility_level as their namespaces. This
will make some projects internal or private when they would previously have
been public or internal, but this is better than silently making an internal
or private group public.

reactivates all tests and writes more tests for it

email token be reset

performance

We see that many slow queries on GitLab.com are dominated by finding
the project import data for a specific project. Adding an index is
the most straightforward way of fixing this.

Closes #23748

Signed-off-by: NRémy Coutable <remy@rymai.me>

Code improvements, bug fixes, finish documentation and specs

mail_room was configured to deliver mail to the `incoming_email`
queue while `EmailReceiveWorker` was reading the `email_receiver`
queue. Adds a migration that repeats the work of a previous
migration to ensure all mails that wound up in the old
queue get processed.

Closes #23689