filter SoUD devices when scanning the network to import new facilities

[jredrejo]

Summary

When a superuser tries to import new facilities, subsets of users devices should not be shown nor found in the list of available devices to look for new facilites

References

Closes: #8276

Reviewer guidance

1. Setup a subset of users device (a.k.a. learn only device) a
2. Setup another kolibri server, both in your network

Before this PR:

• superuser of the kolibri server will see the SoUD when scanning facilities to import

After this PR:

• superuser of the kolibri server will NOT see the SoUD when scanning facilities to import

Testing checklist

• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical user journeys are covered by Gherkin stories
• Critical and brittle code paths are covered by unit tests

PR process

• PR has the correct target branch and milestone
• PR has 'needs review' or 'work-in-progress' label
• If PR is ready for review, a reviewer has been added. (Don't use 'Assignees')
• If this is an important user-facing change, PR or related issue has a 'changelog' label
• If this includes an internal dependency change, a link to the diff is provided

Reviewer checklist

• Automated test coverage is satisfactory
• PR is fully functional
• PR has been tested for accessibility regressions
• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
• Contributor is in AUTHORS.md

[rtibbles]

A couple of questions.

[rtibbles]

And I had forgotten that for fields only filtering you can just do this instead of even defining a FilterSet!