"Trigger pipelines for mirror updates" option not visible in import URL

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From #25314 (comment 619901199):

When you go to an existing project and set up a mirror, you get a number of options:

All options are important, but the second one (mirror_trigger_builds) is particularly important for people who want to use CI/CD with GitLab.

If you import a new project, you only get this option:

If you have one pull mirror defined and visit the settings page, you don't see any indication that mirror_trigger_builds is even an option:

Since you can't edit the options in the mirrors, the only way to update this without modifying the database directly is to delete the mirror and recreate it.

Proposals:

1. In the import screen, the extra checkboxes should be should revealed if Mirror repository is clicked.
2. Show the mirror_trigger_builds option as a column in the mirror list.
3. Make it possible to edit these options in existing mirrors.