Make filter strings case insensitive in filter_products methods

[snbianco]

Use case insensitivity when filtering by file extension or a string column in either MastMissions.filter_products or Observations.filter_products.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.72%. Comparing base (7f99790) to head (b4ccef0).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3427   +/-   ##
=======================================
  Coverage   70.71%   70.72%           
=======================================
  Files         232      232           
  Lines       20037    20041    +4     
=======================================
+ Hits        14170    14174    +4     
  Misses       5867     5867           

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[bsipocz]

Thank you, this looks all good. I'll push the rebase now to resolve the conflict and then merge it.