fix(datamodel): add missing attachment relationships

[grantfitzsimmons]

Fixes #8181

There were missing attachment data model relationships for some of the new tables. This fixes that.

Testing instructions

• Perform a batch edit on an attachment table and verify that you can save and commit the changes (see Missing reverse relationships in datamodel.py for new *Attachment models #8181)

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[bhumikaguptaa]

• Perform a batch edit on an attachment table and verify that you can save and commit the changes (see #8181)

I tried running a query on the Attachments table and ran into an "AttributeError" on the Absolute Age and Relative Age fields. It only happened with Attachment as a base table, and not when Collection Object was the base table.

Crash Report: Specify 7 Crash Report - 2026-06-11T15_46_07.572Z.txt

Query: New Query.json

Issue Branch:

Screen.Recording.2026-06-11.at.10.41.54.AM.1.mov

Link to DB: https://ojsmnh20260326-issue-8181.test.specifysystems.org/specify/query/334/