Soft email confirmation flow

Closes #47003

See merge request gitlab-org/gitlab-ce!31245

These are not required because MySQL is not
supported anymore

This change adds audit logs for user impersonation
when an admin starts/stops impersonating
another user.

As we noticed in
https://gitlab.com/gitlab-org/gitlab-ce/issues/56627#note_185828742,
clicking on the "Issues" tab often requests the same reference in
rendering Markdown.

This sets up all the basics for importing Phabricator tasks into
GitLab issues.

To import all tasks from a Phabricator instance into GitLab, we'll
import all of them into a new project that will have its repository
disabled.

The import is hooked into a regular ProjectImport setup, but similar
to the GitHub parallel importer takes care of all the imports itself.

In this iteration, we're importing each page of tasks in a separate
sidekiq job.

The first thing we do when requesting a new page of tasks is schedule
the next page to be imported. But to avoid deadlocks, we only allow a
single job per worker type to run at the same time.

For now we're only importing basic Issue information, this should be
extended to richer information.

- This can be accessed with Session.current and is restored after.
- Data can be stored under a key with NamespacedSessionStore