Failure to get IntelliSense to work (no solution / project not on solution)

## Issue Description ##

I am just loading a simple csproj below, which references relative csprojs from CppSharp.

IntelliSense won't work and the using directives are not recognized as necessary.

![image](https://github.com/user-attachments/assets/41a30226-4454-4d19-8648-65136f44932c)

Project seems well loaded in the solution explorer:

![image](https://github.com/user-attachments/assets/64e8eb3a-3601-4932-a23f-bcc12ac54f57)

Active context seems correct as well:

![image](https://github.com/user-attachments/assets/fb094de4-5f9a-46ac-a35b-a37a198d59cd)

What could be the issue:

## Steps to Reproduce ##

This is my csproj:

```
<Project Sdk="Microsoft.NET.Sdk">

  <ItemGroup>
    <ProjectReference Include="..\..\tools\cppsharp\src\AST\CppSharp.AST.csproj" />
    <ProjectReference Include="..\..\tools\cppsharp\src\Core\CppSharp.csproj" />
    <ProjectReference Include="..\..\tools\cppsharp\src\CppParser\Bindings\CSharp\CppSharp.Parser.CSharp.csproj" />
    <ProjectReference Include="..\..\tools\cppsharp\src\Generator\CppSharp.Generator.csproj" />
    <ProjectReference Include="..\..\tools\cppsharp\src\Parser\CppSharp.Parser.csproj" />
  </ItemGroup>

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

</Project>
```

## Expected Behavior ##

## Actual Behavior ##

## Logs ##

[output_logging_20240915T005141.zip](https://github.com/user-attachments/files/17004107/output_logging_20240915T005141.zip)

## Environment information ##

**VSCode version**: 1.92.2
**C# Extension**: 2.46.32
**Using OmniSharp**: false


<details><summary>Dotnet Information</summary>
.NET SDK:
 Version:           8.0.401
 Commit:            811edcc344
 Workload version:  8.0.400-manifests.b6724b7a
 MSBuild version:   17.11.4+37eb419ad

Runtime Environment:
 OS Name:     linuxmint
 OS Version:  20.3
 OS Platform: Linux
 RID:         linux-x64
 Base Path:   /home/joao/.dotnet/sdk/8.0.401/

.NET workloads installed:
Configured to use loose manifests when installing new manifests.
There are no installed workloads to display.

Host:
  Version:      8.0.8
  Architecture: x64
  Commit:       08338fcaa5

.NET SDKs installed:
  8.0.401 [/home/joao/.dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 8.0.8 [/home/joao/.dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 8.0.8 [/home/joao/.dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
  None

Environment variables:
  Not set

global.json file:
  Not found

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download
</details>
<details><summary>Visual Studio Code Extensions</summary>

|Extension|Author|Version|Folder Name|
|---|---|---|---|
|csdevkit|ms-dotnettools|1.11.6|ms-dotnettools.csdevkit-1.11.6-linux-x64|
|csharp|ms-dotnettools|2.46.32|ms-dotnettools.csharp-2.46.32-linux-x64|
|vscode-dotnet-runtime|ms-dotnettools|2.1.5|ms-dotnettools.vscode-dotnet-runtime-2.1.5|;

</details>


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Failure to get IntelliSense to work (no solution / project not on solution) #7570

tritao
openedon Sep 14, 2024

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Extension	Author	Version	Folder Name
csdevkit	ms-dotnettools	1.11.6	ms-dotnettools.csdevkit-1.11.6-linux-x64
csharp	ms-dotnettools	2.46.32	ms-dotnettools.csharp-2.46.32-linux-x64
vscode-dotnet-runtime	ms-dotnettools	2.1.5	ms-dotnettools.vscode-dotnet-runtime-2.1.5