Fix CA1859 improperly handling default interface implementations

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This fixes dotnet/sdk#50328

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@dotnet-policy-service agree

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.85%. Comparing base (714a51c) to head (e8a6c54).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    dotnet/roslyn-analyzers#7748      +/-   ##
==========================================
+ Coverage   96.84%   96.85%   +0.01%     
==========================================
  Files        1220     1239      +19     
  Lines      308790   311585    +2795     
  Branches     9554     9601      +47     
==========================================
+ Hits       299041   301793    +2752     
- Misses       7402     7422      +20     
- Partials     2347     2370      +23     

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cc: @Dean-NC, @geeknoid, @Youssef1313

[ViktorHofer]

Microsoft.CodeAnalysis.NetAnalyzers moved into the dotnet/sdk repository. This repository's main branch is archived. Please see README.md for more details. The migrated component can be found here. Feel free to re-submit this PR in dotnet/sdk and sorry for the inconvenience!

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Thanks for the heads up! I made a new PR there: dotnet/sdk#50314