Hotfix for regression tests broken by filename changes

[WilliamJamieson]

This PR fixes regression tests broken by spacetelescope/roman_datamodels#295. In those changes, data models now ensure their meta.filename (if they have one) is set in the written model to the name chosen for the file written. The broken tests wrote the same data model to two different file names and then tried to compare them. This PR simply makes it so that they placed in separate directories so they can have the same file name.

Checklist

• added entry in CHANGES.rst under the corresponding subsection
• updated relevant tests
• updated relevant documentation
• updated relevant milestone(s)
• added relevant label(s)
• ran regression tests, post a link to the Jenkins job below. How to run regression tests on a PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.94%. Comparing base (1a458a0) to head (7844ddc).
Report is 478 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1050   +/-   ##
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  Coverage   70.94%   70.94%           
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  Files         105      105           
  Lines        6979     6979           
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  Hits         4951     4951           
  Misses       2028     2028           

Flag	Coverage Δ		*Carryforward flag
nightly	63.06% <ø> (ø)		Carriedforward from 1a458a0

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