Fix delete facility

[TaiWilkin]

Overview

Allows facilities to be deleted when their created_from
FacilityListItem has multiple associated FacilityMatches.

Connects #1992

Testing Instructions

On develop:

• Run ./scripts/manage shell_plus.

f = Facility.objects.first()
FacilityMatch.objects.create(status='PENDING', facility=f, facility_list_item=f.created_from, confidence=0.7, results='')
f.id

• Note the facility id.
• Run ./scripts/server
• Login as c1@example.com and go to the delete facility tool. Search for the facility id from above, and delete it. The deletion should fail.

On this branch:

• Attempt to delete the same facility on this branch. It should succeed.

Checklist

• fixup! commits have been squashed
• CI passes after rebase
• CHANGELOG.md updated with summary of features or fixes, following Keep a Changelog guidelines
• This PR is targeted at the correct branch (develop vs. ogr/develop)
• If this PR applies to both OAR and OGR a companion PR has been created

[TaiWilkin]

Thanks for reviewing!