Fix invalid expression for total count on inverse relationship filter from resource definition

[bkoelman]

When the total count on a secondary/relationship endpoint is queried, and the primary filter originates from IResourceDefinition.OnApplyFilter, the resulting expression is invalid. Since we're using the inverse relationship here, for many-to-many the solution is to move to the proper scope. For many-to-one endpoints, we cannot solve this, so do not return a total instead of crashing.

Fixes #1671.

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• N/A: Documentation updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.64%. Comparing base (b97fdd4) to head (ac31043).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1711   +/-   ##
=======================================
  Coverage   90.64%   90.64%           
=======================================
  Files         355      355           
  Lines       11566    11569    +3     
  Branches     1908     1909    +1     
=======================================
+ Hits        10484    10487    +3     
  Misses        706      706           
  Partials      376      376           

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