ResxSourceGenerator brokes WinForms application build

**Version Used**: Microsoft.CodeAnalysis.ResxSourceGenerator Version="5.0.0-1.25277.114

**Steps to Reproduce**:

1. Grab test WinForms app: [WinFormsApp7.zip](https://github.com/user-attachments/files/27245348/WinFormsApp7.zip) or create your own with the following steps:
* `dotnet new winforms`
* open project in VS, open form editor - it will create `Form1.resx` for you.
* install source generator `dotnet add package Microsoft.CodeAnalysis.ResxSourceGenerator --version 5.0.0-1.25277.114`
2. `dotnet build`
3. Observe build errors (see below).
4. (optional) Remove `Microsoft.CodeAnalysis.ResxSourceGenerator` reference from the csproj
5. (optional) Build again - now it builds successfully.

**Diagnostic Id**: Multiple CSXXX build errors during the incorrect source generation

If this is a report about a bug in an analyzer, please include the diagnostic ID and message if possible (e.g. `"IDE0030: Use coalesce expression"`).

**Expected Behavior**: project builds successfully

**Actual Behavior**: build errors.
```Restore complete (0.7s)
WinFormsApp7 net10.0-windows failed with 7 error(s) (0.3s)
D:\delme\WinFormsApp7\Form1.cs(3,22): error CS0262: Partial declarations of 'Form1' have conflicting accessibility modifiers
D:\delme\WinFormsApp7\Form1.cs(3,30): error CS0713: Static class 'Form1' cannot derive from type 'Form'. Static classes must derive from object.
D:\delme\WinFormsApp7\Form1.cs(5,12): error CS0710: Static classes cannot have instance constructors
D:\delme\WinFormsApp7\Form1.Designer.cs(8,46): error CS0708: 'Form1.components': cannot declare instance members in a static class
D:\delme\WinFormsApp7\Form1.Designer.cs(14,29): error CS0708: 'Dispose': cannot declare instance members in a static class
D:\delme\WinFormsApp7\Form1.Designer.cs(29,18): error CS0708: 'InitializeComponent': cannot declare instance members in a static class
D:\delme\WinFormsApp7\Form1.Designer.cs(14,29): error CS1057: 'Form1.Dispose(bool)': static classes cannot contain protected members
```
## Additional details
The project contains `Form1.resx` which is created by the WinForms editor. The source generator catches that file and produce the `internal static partial class Form1` class from it. And this class conflicts with the *normal* non-static public `Form1` class.

## Workaround
Manually exclude all the WinForms-related resources from the generator processing: ``. This removes the build error and at the first sight does prevent WinForms from using their resources.