improve test coverage for dimension cleanup

[danielfromearth]

GitHub Issue: #237

Description

Improved test coverage, though dimension cleanup still has the main duplicate dimension function not covered. It needs further work, or to be removed following the implementation of using DataTree (as in issue #138).

PR Acceptance Checklist

• Unit tests added/updated and passing.
• Integration testing
• CHANGELOG.md updated
• Documentation updated (if needed).

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📚 Documentation preview 📚: https://stitchee--248.org.readthedocs.build/en/248/

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (release/1.6.0@2e38bb3). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
concatenator/dimension_cleanup.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##             release/1.6.0     #248   +/-   ##
================================================
  Coverage                 ?   88.11%           
================================================
  Files                    ?       11           
  Lines                    ?      648           
  Branches                 ?        0           
================================================
  Hits                     ?      571           
  Misses                   ?       77           
  Partials                 ?        0           

Flag	Coverage Δ
integration	44.90% <0.00%> (?)
unittests	85.64% <25.00%> (?)

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