feat: add convenience method for loading first of many by simple field equality

[wschurman]

Why

In some cases it is helpful to be able to load a single entity of many matching a field equality (see the PR stacked on top of this one for example).

We already provide loadFirstByFieldEqualityConjunctionAsync but this adds another convenience method for the case where order is undefined.

How

Add method and tests.

Test Plan

Run tests.

[wschurman]

• feat: add EntityEdgeDeletionAuthorizationInferenceBehavior for canViewerDeleteAsync #243
• feat: add convenience method for loading first of many by simple field equality #244 👈
• main

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (15117fc) to head (0492011).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #244   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           72        72           
  Lines         1949      1955    +6     
  Branches       267       269    +2     
=========================================
+ Hits          1949      1955    +6     

Flag	Coverage Δ
integration	100.00% <100.00%> (ø)
unittest	100.00% <100.00%> (ø)

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