Reduce the default severity of preferring conditional expressions

Closes #27195

src/Workspaces/Core/Portable/CodeStyle/CodeStyleOptions.cs

@@ -177,7 +177,7 @@ public class CodeStyleOptions
         internal static readonly PerLanguageOption<CodeStyleOption<bool>> PreferConditionalExpressionOverAssignment = new PerLanguageOption<CodeStyleOption<bool>>(
             nameof(CodeStyleOptions),
             nameof(PreferConditionalExpressionOverAssignment),
-            defaultValue: TrueWithSuggestionEnforcement,
+            defaultValue: TrueWithSilentEnforcement,
             storageLocations: new OptionStorageLocation[]{
                 EditorConfigStorageLocation.ForBoolCodeStyleOption("dotnet_style_prefer_conditional_expression_over_assignment"),
                 new RoamingProfileStorageLocation("TextEditor.%LANGUAGE%.Specific.PreferConditionalExpressionOverAssignment")});
@@ -185,7 +185,7 @@ public class CodeStyleOptions
         internal static readonly PerLanguageOption<CodeStyleOption<bool>> PreferConditionalExpressionOverReturn = new PerLanguageOption<CodeStyleOption<bool>>(
             nameof(CodeStyleOptions),
             nameof(PreferConditionalExpressionOverReturn),
-            defaultValue: TrueWithSuggestionEnforcement,
+            defaultValue: TrueWithSilentEnforcement,
             storageLocations: new OptionStorageLocation[]{
                 EditorConfigStorageLocation.ForBoolCodeStyleOption("dotnet_style_prefer_conditional_expression_over_return"),
                 new RoamingProfileStorageLocation("TextEditor.%LANGUAGE%.Specific.PreferConditionalExpressionOverReturn")});