JsonPatchDocumentConverter is not public

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Describe the bug

I'm using JSON source generators and am struggling with the new JsonPatchDocument in .NET 10. The code gives me a SYSLIB1030 warning, and when I look at that webpage it mentions requiring a public constructor, but the JsonPatchDocumentConverter is internal, not public.

### Expected Behavior

Should be able to serialize.

### Steps To Reproduce

```
[JsonSerializable(typeof(JsonPatchDocument))]
[JsonSerializable(typeof(JsonPatchDocument))]
[JsonSerializable(typeof(PatchExecutionConfigRequestDocument))]
public partial class ExampleContext : JsonSerializerContext;

public sealed class PatchExecutionConfigRequestDocument
{
public string? MilestoneName { get; set; }

public int? OwnerId { get; set; }
}
```

### Exceptions (if any)

```
System.NotSupportedException: JsonTypeInfo metadata for type 'Microsoft.AspNetCore.JsonPatch.SystemTextJson.JsonPatchDocument`1[SDC.Server.ExecutionConfigs.PatchExecutionConfigRequestDocument]' was not provided by TypeInfoResolver of type 'System.Text.Json.Serialization.Metadata.JsonTypeInfoResolverWithAddedModifiers'. If using source generation, ensure that all root types passed to the serializer have been annotated with 'JsonSerializableAttribute', along with any types that might be serialized polymorphically.
at System.Text.Json.ThrowHelper.ThrowNotSupportedException_NoMetadataForType(Type type, IJsonTypeInfoResolver resolver)
at System.Text.Json.JsonSerializerOptions.GetTypeInfoInternal(Type type, Boolean ensureConfigured, Nullable`1 ensureNotNull, Boolean resolveIfMutable, Boolean fallBackToNearestAncestorType)
at System.Text.Json.JsonSerializerOptions.GetTypeInfoForRootType(Type type, Boolean fallBackToNearestAncestorType)
at System.Text.Json.JsonSerializer.DeserializeAsync(PipeReader utf8Json, Type returnType, JsonSerializerOptions options, CancellationToken cancellationToken)
at Microsoft.AspNetCore.Http.HttpRequestJsonExtensions.ReadFromJsonAsync(HttpRequest request, Type type, JsonSerializerOptions options, CancellationToken cancellationToken)
at Microsoft.AspNetCore.Http.HttpRequestJsonExtensions.ReadFromJsonAsync(HttpRequest request, Type type, JsonSerializerOptions options, CancellationToken cancellationToken)
at FastEndpoints.RequestBinder`1.BindJsonBody(HttpRequest httpRequest, JsonSerializerContext serializerCtx, CancellationToken ct)
at FastEndpoints.RequestBinder`1.BindAsync(BinderContext ctx, CancellationToken ct)
at FastEndpoints.Endpoint`2.BindRequestAsync(EndpointDefinition def, HttpContext ctx, List`1 failures, CancellationToken ct)
at FastEndpoints.Endpoint`2.ExecAsync(CancellationToken ct)
at FastEndpoints.Endpoint`2.ExecAsync(CancellationToken ct)
at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)
```

### .NET Version

10.0.102

### Anything else?

.NET SDK:
Version: 10.0.102
Commit: 4452502459
Workload version: 10.0.100-manifests.6d969a7e
MSBuild version: 18.0.7+445250245

Runtime Environment:
OS Name: Windows
OS Version: 10.0.26100
OS Platform: Windows
RID: win-x64
Base Path: C:\Program Files\dotnet\sdk\10.0.102\

.NET workloads installed:
There are no installed workloads to display.
Configured to use workload sets when installing new manifests.
No workload sets are installed. Run "dotnet workload restore" to install a workload set.

Host:
Version: 10.0.2
Architecture: x64
Commit: 4452502459

.NET SDKs installed:
10.0.102 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 8.0.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 9.0.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 10.0.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 8.0.23 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 9.0.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 10.0.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 8.0.23 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 10.0.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
x86 [C:\Program Files (x86)\dotnet]
registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
DOTNET_CLI_TELEMETRY_OPTOUT [1]

global.json file:
C:\...\global.json

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