IDE0079 configuration not respected

**Version Used**:
Visual Studio 2026 Insiders 11201.2

**Steps to Reproduce**:

Test.cs

``` C#
namespace What;

public class Test
{
#pragma warning disable IDE0051
readonly int UsedNow = 5;
#pragma warning restore IDE0051
public int Used() => UsedNow;
}
```
.editorconfig
``` INI
[*.cs]
dotnet_remove_unnecessary_suppression_exclusions = none
dotnet_diagnostic.IDE0079.severity = warning
```

**Expected Behavior**:

A warning in the IDE about unnecessary suppression

**Actual Behavior**:
No warning

Start by reproducing the issue with the Test.cs example and the provided .editorconfig in Visual Studio 2026 Insiders. Trace the IDE0079 analyzer configuration and suppression handling; done means the configured warning appears for the unnecessary IDE0051 suppression.

Written by the indexing model from the issue text.