remove unused and buggy test code

[braingram]

data_glob is buggy (spacetelescope/jwst#10773) and is unused here in romancal. This PR removes the unused data_glob and other unused data_glob code. If at a later point code like this is needed the up-to-date (and hopefully less-buggy) jwst version could be brought over.

Regtests all pass:
https://github.com/spacetelescope/RegressionTests/actions/runs/31731300565

Tasks

• request a review from someone specific, to avoid making the maintainers review every PR
• add a build milestone, i.e. 24Q4_B15 (use the latest build if not sure)
• Does this PR change user-facing code / API? (if not, label with no-changelog-entry-needed)
  • write news fragment(s) in changes/: echo "changed something" > changes/<PR#>.<changetype>.rst (see changelog readme for instructions)
    • if your change breaks existing functionality, also add a changes/<PR#>.breaking.rst news fragment
  • update or add relevant tests
  • update relevant docstrings and / or docs/ page
  • start a regression test and include a link to the running job (click here for instructions)
    • Do truth files need to be updated ("okified")?
      • after the reviewer has approved these changes, run okify_regtests to update the truth files
• if a JIRA ticket exists, make sure it is resolved properly

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.31%. Comparing base (f79401d) to head (7e17fd4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2415      +/-   ##
==========================================
+ Coverage   82.87%   83.31%   +0.44%     
==========================================
  Files         131      131              
  Lines        7265     7218      -47     
==========================================
- Hits         6021     6014       -7     
+ Misses       1244     1204      -40     

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