Fix maps not being created in CAMS2_83

[lewisblake]

Change Summary

The cams2_83 reader required a daterange argument, which was not being picked up in kwargs, partially due to do work that Daniel and I did to move the model_kwargs argument closer to the model entry instance. i.e., not in the colocation_opts. This was meant to minimize confusion and simplify things but it was not being picked up in the ModelMapsEngine (which occurs prior to the regular collocations) and hence crashing. In the regular collocation, keys which are in specific model_entry instances are copied over to the colocation_opts and the kwargs for the model reader are picked up from there. Hence, why this did not crash the regular collocation code, and only appears in the CAMS2_83, where this specific daterange argument is required by reader.read_var()

Related issue number

close #1380

please test @charlienegri

Checklist

• Start with a draft-PR
• The PR title is a good summary of the changes
• PR is set to AeroTools and a tentative milestone
• Documentation reflects the changes where applicable
• Tests for the changes exist where applicable
• Tests pass locally
• Tests pass on CI
• At least 1 reviewer is selected
• Make PR ready to review

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.54%. Comparing base (9300b96) to head (67be8ec).
Report is 18 commits behind head on main-dev.

Additional details and impacted files

@@             Coverage Diff              @@
##           main-dev    #1381      +/-   ##
============================================
+ Coverage     78.50%   78.54%   +0.03%     
============================================
  Files           136      137       +1     
  Lines         20860    20900      +40     
============================================
+ Hits          16377    16415      +38     
- Misses         4483     4485       +2     

Flag	Coverage Δ
unittests	78.54% <100.00%> (+0.03%)	⬆️

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[charlienegri]

output is being produced 👍 , I think this is ready to be merged

[thorbjoernl]

LGTM 🚀