fix: build warnings in analyzer test project

[samtrion]

Summary

• Replace deprecated HasCount() assertion with Count()
• Add StringComparer.Ordinal to Dictionary<string, string?> instances (MA0002)
• Add ConfigureAwait(false) to awaited calls in test code (MA0004)

Test plan

• dotnet build reports 0 warnings, 0 errors
• dotnet test tests/NetEvolve.Defaults.Analyzer.Tests.Unit — 55/55 passed

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (8b300e6) to head (7efac9b).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #480   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           16        16           
  Branches         1         1           
=========================================
  Hits            16        16           

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