Verify Geo install

What does this merge request do and why?

Adds an optional geo-install job which can be run in order to make sure that https://gitlab.com/gitlab-org/gitlab-development-kit/-/blob/main/doc/howto/geo.md#easy-installation works.

Resolves #1233 (closed)

Impacted categories

The following categories relate to this merge request:

• gdk-reliability - e.g. When a GDK action fails to complete.
• gdk-usability - e.g. Improvements or suggestions around how the GDK functions.
• gdk-performance - e.g. When a GDK action is slow or times out.

Merge request checklist

• This change is backward compatible. If not, please include steps to communicate to our users.
• [-] Tests added for new functionality. If not, please raise an issue to follow-up. => This MR is adding an optional integration test.
• Documentation added/updated, if needed.
• [-] Announcement added, if change is notable.
• [-] gdk doctor test added, if needed.
• [-] Add the ~highlight label if this MR should be included in the CHANGELOG.md.