Find All References finds definition

Type: Bug

## Issue Description ##

My VSCode setup is mainly focused in Unity3D projects., with C# Dev Kit, and so on.

As oppossed to Visual Studio, using "Find All References", finds and lists among the references the symbols own definition. This is incorrect and distracting to read among the listed references, as well as misguiding in the cases when there are in fact, no references to that symbol.

I have found no settings that may help with this behaviour, can I change it somehow?
Thanks for any help!

## Steps to Reproduce ##

1. Use Find all references. (In my case is in a Unity project setup, with C# Dev Kit).
2. The symbol definition will be listed among its references.

## Environment information ##

**VSCode version**: 1.81.1
**C# Extension**: 2.0.413
**Using OmniSharp**: false

Dotnet Information

Host:
Version: 7.0.10
Architecture: x64
Commit: a6dbb800a4

.NET SDKs installed:
No SDKs were found.

.NET runtimes installed:
Microsoft.NETCore.App 7.0.10 [c:\Users\Operador\AppData\Roaming\VSCodium\User\globalStorage\ms-dotnettools.vscode-dotnet-runtime\.dotnet\7.0.10\shared\Microsoft.NETCore.App]

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

Environment variables:
Not set

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|
|---|---|---|---|
|code-settings-sync|Shan|3.4.3|shan.code-settings-sync-3.4.3|
|codeium|Codeium|1.2.71|codeium.codeium-1.2.71|
|csdevkit|ms-dotnettools|0.3.21|ms-dotnettools.csdevkit-0.3.21-win32-x64|
|csharp|ms-dotnettools|2.0.413|ms-dotnettools.csharp-2.0.413-win32-x64|
|github-dark-plus|NAPTheDevHcj|0.0.1|napthedevhcj.github-dark-plus-0.0.1|
|one-monokai|azemoh|0.5.0|azemoh.one-monokai-0.5.0|
|open-unity-meta|codesteady|0.0.1|codesteady.open-unity-meta-0.0.1|
|renamer|VolcanicBytes|0.1.0|volcanicbytes.renamer-0.1.0|
|shortcuts|gizak|0.0.1|gizak.shortcuts-0.0.1|
|smartsemicolon|seunghwan|1.0.3|seunghwan.smartsemicolon-1.0.3|
|trailing-spaces|shardulm94|0.4.1|shardulm94.trailing-spaces-0.4.1|
|unity-code-snippets|kleber-swf|2.2.5|kleber-swf.unity-code-snippets-2.2.5|
|unity-event-lens|dgileadi|1.0.0|dgileadi.unity-event-lens-1.0.0|
|unity-find-in-prefabs|jarvisjiang|1.0.11|jarvisjiang.unity-find-in-prefabs-1.0.11|
|unity-quick-docs|ColdThunder11|1.0.2|coldthunder11.unity-quick-docs-1.0.2|
|vscode-csharp-snippets|jorgeserrano|1.1.0|jorgeserrano.vscode-csharp-snippets-1.1.0|
|vscode-dotnet-runtime|ms-dotnettools|1.7.0|ms-dotnettools.vscode-dotnet-runtime-1.7.0-universal|
|vscode-unitymeta|PTD|0.0.7|ptd.vscode-unitymeta-0.0.7|
|vstuc|visualstudiotoolsforunity|0.9.0|visualstudiotoolsforunity.vstuc-0.9.0|;

Extension version: 2.0.413
VSCodium version: VSCodium 1.81.1 (aef377c42cea6e9aea642829953104f07097abfa, 2023-08-10T18:29:45.715Z)
OS version: Windows_NT x64 10.0.19045
Modes:

System Info

|Item|Value|
|---|---|
|CPUs|AMD Ryzen 9 3900X 12-Core Processor (24 x 3793)|
|GPU Status|2d_canvas: enabled
canvas_oop_rasterization: disabled_off
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
video_decode: enabled
video_encode: enabled
vulkan: disabled_off
webgl: enabled
webgl2: enabled
webgpu: enabled|
|Load (avg)|undefined|
|Memory (System)|31.92GB (17.33GB free)|
|Process Argv||
|Screen Reader|no|
|VM|0%|