v2.100.5 and v2.110.4 formatter ignores .editorconfig

Type: Bug

## Issue Description ##
v2.100.5 and v2.110.4 formatter ignores `.editorconfig`
I have downgraded to v2.97.38
For v2.97.38, I recommend adding the following settings to `settings.json`
Detail: #8709
```json
{
"[csharp]": {
"editor.formatOnType": false
}
}
```

- How to downgrade
1. Open the extension
2. Click the `V` (dropdown?) to the right of the Uninstall button
3. Click "Install Specific Version..."

4. Click "2.97.38"
5. Click "X" button and restart VSCode
Note: "Restart Extension" button does not work

Explanation in Japanese
https://zenn.dev/umitempa/articles/99e0080f767000

## Steps to Reproduce ##
1. Downgrade to v2.97.38
2. Click "X" button and restart VSCode
Note: "Restart Extension" button does not work
3. Create the following files in the same directory

.vscode\settings.json
```json
{
"editor.formatOnSave": true,
"[csharp]": {
"editor.defaultFormatter": "ms-dotnettools.csharp",
"editor.formatOnType": false
}
}
```

.editorconfig
```
root = true

[*.cs]
indent_size = 2
indent_style = space
csharp_new_line_before_open_brace = none
```

Program.cs
```csharp
using System;

class Program
{
static void Main()
{
Console.WriteLine("Hello, World!");
}
}
```

4. Format `Program.cs`
The code should look like this after formatting
```csharp
using System;

class Program {
static void Main() {
Console.WriteLine("Hello, World!");
}
}
```

5. Update to v2.110.4
6. Click "X" button and restart VSCode
Note: "Restart Extension" button doesn't work
7. Format `Program.cs`

## Expected Behavior ##
It should be the same as step 4

## Actual Behavior ##
Formatter ignores `.editorconfig`
```csharp
using System;

class Program
{
static void Main()
{
Console.WriteLine("Hello, World!");
}
}
```

Extension version: 2.100.5
VS Code version: Code 1.107.1 (994fd12f8d3a5aa16f17d42c041e5809167e845a, 2025-12-17T14:15:14.850Z)
OS version: Windows_NT x64 10.0.26100
Modes:

### Logs ###

### C# log ###

```
2026-01-08 19:28:02.691 [info] Locating .NET runtime version 9.0.1
2026-01-08 19:28:02.726 [info] Dotnet path: C:\Program Files\dotnet\dotnet.exe
2026-01-08 19:28:02.726 [info] Activating C# standalone...
2026-01-08 19:28:02.990 [info] [stdout] info: Program[0]
Server started with process ID 17200

2026-01-08 19:28:03.449 [info] [stdout] {"pipeName":"\\\\.\\pipe\\3039adca"}

2026-01-08 19:28:03.449 [info] received named pipe information from server
2026-01-08 19:28:03.449 [info] client has connected to server
2026-01-08 19:28:03.544 [info] [Program] Language server initialized

```

### C# LSP トレース ログ log ###

```

```

## Environment Information ##
**VSCode version**: 1.107.1
**C# Extension**: 2.100.5
**Using OmniSharp**: false

Dotnet Information
.NET SDK:
Version: 10.0.101
Commit: fad253f51b
Workload version: 10.0.100-manifests.9f71effe
MSBuild version: 18.0.6+fad253f51

Runtime Environment:
OS Name: Windows
OS Version: 10.0.26100
OS Platform: Windows
RID: win-x64
Base Path: C:\Program Files\dotnet\sdk\10.0.101\

.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: 10.0.1
Architecture: x64
Commit: fad253f51b

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

.NET runtimes installed:
Microsoft.AspNetCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.22 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 10.0.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.22 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 10.0.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.22 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 10.0.1 [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 [true]
DOTNET_CLI_UI_LANGUAGE [en-US]

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download

Visual Studio Code Extensions

|Extension|Author|Version|Folder Name|
|---|---|---|---|
|csharp|ms-dotnettools|2.100.5|ms-dotnettools.csharp-2.100.5-win32-x64|
|hexeditor|ms-vscode|1.11.1|ms-vscode.hexeditor-1.11.1|
|prettier-vscode|esbenp|11.0.2|esbenp.prettier-vscode-11.0.2|
|vscode-dotnet-runtime|ms-dotnettools|3.0.0|ms-dotnettools.vscode-dotnet-runtime-3.0.0|
|vscode-eslint|dbaeumer|3.0.20|dbaeumer.vscode-eslint-3.0.20|
|vscode-language-pack-ja|MS-CEINTL|1.107.2025121009|ms-ceintl.vscode-language-pack-ja-1.107.2025121009|;

C# Settings

|Setting|Value|
|---|---|
|preferCSharpExtension|false|
|compilerDiagnosticScope|openFiles|
|analyzerDiagnosticScope|openFiles|
|enableXamlTools|true|
|useServerGC|true|;

System Info

|Item|Value|
|---|---|
|CPUs|Intel(R) Core(TM) i5-14400F (16 x 2496)|
|GPU Status|2d_canvas: enabled
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_graphite: disabled_off
trees_in_viz: disabled_off
video_decode: enabled
video_encode: enabled
webgl: enabled
webgl2: enabled
webgpu: enabled
webnn: disabled_off|
|Load (avg)|undefined|
|Memory (System)|31.84GB (22.73GB free)|
|Process Argv||
|Screen Reader|no|
|VM|0%|