style-change: suppress "IDE0078: Use pattern matching"

This inspection broke some of our code:
dotnet/roslyn#75122

On a side note, it turns out that all inspection-fixers can change
code meaning, so none of the inspections are safe.

IDE0078: Use pattern matching:
https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/style-rules/ide0078-ide0260

.editorconfig

@@ -160,5 +160,9 @@ dotnet_diagnostic.IDE0047.severity = none
 # Issue link: https://github.com/have-fun-was-taken/yafc-ce/issues/181
 dotnet_diagnostic.IDE0052.severity = none
 
+# Suppress "IDE0078: Use pattern matching" because it breaks code.
+# See https://github.com/dotnet/roslyn/issues/75122 for details
+csharp_style_prefer_pattern_matching = false:none
+
 # Disable "IDE0130: Namespace does not match folder structure" because VS Code Cleanup applies it automatically and breaks things.
 dotnet_style_namespace_match_folder = false