feat(covmanager): modify all report filters to be case insensitive

[pyoor]

Closes #487

[sentry]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 63.25%. Comparing base (d89b40f) to head (f3937d7).

Files with missing lines	Patch %	Lines
server/covmanager/views.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #1133    +/-   ##
========================================
  Coverage   63.25%   63.25%            
========================================
  Files         177      177            
  Lines       12085    12085            
  Branches      537      861   +324     
========================================
  Hits         7644     7644            
  Misses       4407     4407            
  Partials       34       34            

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[jschwartzentruber]

LGTM but needs to be rebased on #1134 for CI to pass because we dropped Python 3.9 in fuzzing-decision