[FC: 0099] fix: add plugin_settings function in test settings

[BryanttV]

Description

This PR adds the plugin_settings function to the test.py settings file.

Supporting Information

https://github.com/openedx/edx-platform/actions/runs/18655184882/job/53182435487?pr=37501#step:12:96

Merge Checklist

Check off if complete or not applicable:

• Version bumped
• Changelog record added
• Documentation updated (not only docstrings)
• Fixup commits are squashed away
• Unit tests added/updated
• Manual testing instructions provided
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

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