Records blocking deletion can be removed from "Delete Blocked" dialog #5147

Describe the bug
Clicking on the link to resources blocking deletion from the "Delete Blocked" dialog creates a fictitious record set. Records can be removed from this without deleting them. This removes the record from the list in the dialog. If all records are removed, the "Delete Blocked" dialog is replaced with a deletion dialog. If you try to delete the original record, an error is thrown.

To Reproduce
Steps to reproduce the behavior:

1. Go to a record that is referenced by other records
2. Click "Delete"
3. From the "Delete Blocked" dialog, click on one of the linked tables and remove records using the red minus button
4. Repeat for all linked tables and see the deletion dialog
5. Click "Delete" and see error

Expected behavior
Either the user should not be able to remove records from the fictitious record set, or removing them from it should not remove them from the list of blocking resources in the "Delete Blocked" dialog.

Screenshots

https://kupaleobot20240606-edge.test.specifysystems.org/specify/view/agent/29000/

Specify 7 System Information - 2024-07-26T17_47_54.510Z.txt

Please, also fill out the following information manually:

• OS: Mac
• Browser: Chrome
• Specify 7 Version: 7.9.3 through edge
• Database Name: KUPaleoBot_2024_06_06
• Collection name: Paleobotany
• User Name: kupaleobotadmin