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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