Fix geo-install job intermittent failure

What does this merge request do and why?

Increases the time that GDK will wait for sshd to start, so that Rails processes have time to initialize the .gitlab_shell_secret file.

Leaves geo-install job allowed to fail for now. We can remove that in a later MR after this gets merged and proves to fix the problem.

Part of #1912

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.
• [-] 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.