Revert PublicAPI directory restructuring

Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

Author: Copilot

src/Features/JsonPatch.SystemTextJson/src/Microsoft.AspNetCore.JsonPatch.SystemTextJson.csproj

@@ -16,11 +16,6 @@
     <Compile Include="$(SharedSourceRoot)CallerArgument\CallerArgumentExpressionAttribute.cs" LinkBase="Shared" />
   </ItemGroup>
 
-  <ItemGroup>
-    <AdditionalFiles Include="PublicAPI/$(TargetFramework)/PublicAPI.Shipped.txt" />
-    <AdditionalFiles Include="PublicAPI/$(TargetFramework)/PublicAPI.Unshipped.txt" />
-  </ItemGroup>
-
   <ItemGroup>
     <Reference Include="Microsoft.AspNetCore.Http.Abstractions" />
   </ItemGroup>

src/Features/JsonPatch.SystemTextJson/src/PublicAPI.Shipped.txt

@@ -0,0 +1 @@
+#nullable enable

src/Features/JsonPatch.SystemTextJson/src/PublicAPI.Unshipped.txt

@@ -1,3 +1,3 @@
 #nullable enable
 Microsoft.AspNetCore.JsonPatch.JsonPatchDocument.PopulateMetadata(System.Reflection.ParameterInfo parameter, Microsoft.AspNetCore.Builder.EndpointBuilder builder) -> void
-Microsoft.AspNetCore.JsonPatch.JsonPatchDocument<TModel>.PopulateMetadata(System.Reflection.ParameterInfo parameter, Microsoft.AspNetCore.Builder.EndpointBuilder builder) -> void
+Microsoft.AspNetCore.JsonPatch.JsonPatchDocument<TModel>.PopulateMetadata(System.Reflection.ParameterInfo parameter, Microsoft.AspNetCore.Builder.EndpointBuilder builder) -> void