Fold All Regions no longer works with new language server

[zeroskyx]

Type: Bug

Issue Description

Using the Fold All Regions command does not collapse regions (it just does nothing).

Steps to Reproduce

1. Add code regions (#region This is a region and #endregion) in a C# document
2. Execute the command Fold All Regions

Expected Behavior

The region This is a region is collapsed.

Actual Behavior

Nothing happens.

Logs

C# log

Post the output from Output-->C# here

C# LSP Trace Logs

Post the output from Output-->C# LSP Trace Logs here. Requires `dotnet.server.trace` to be set to `Trace`

Environment information

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

Dotnet Information

.NET SDK: Version: 7.0.306 Commit: f500069cb7

Runtime Environment:
OS Name: manjaro
OS Version:
OS Platform: Linux
RID: manjaro-x64
Base Path: /home/zeroskyx/Apps/dotnet/sdk/7.0.306/

Host:
Version: 7.0.9
Architecture: x64
Commit: 8e9a17b221

.NET SDKs installed:
7.0.306 [/home/zeroskyx/Apps/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 7.0.9 [/home/zeroskyx/Apps/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 7.0.9 [/home/zeroskyx/Apps/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

Visual Studio Code Extensions

Extension	Author	Version	Folder Name
code-spell-checker	streetsidesoftware	2.20.5	streetsidesoftware.code-spell-checker-2.20.5
code-spell-checker-german	streetsidesoftware	2.2.1	streetsidesoftware.code-spell-checker-german-2.2.1
csharp	ms-dotnettools	2.0.413	ms-dotnettools.csharp-2.0.413-linux-x64
docomment	k--kato	1.0.0	k--kato.docomment-1.0.0
hexeditor	ms-vscode	1.9.12	ms-vscode.hexeditor-1.9.12
rainbow-csv	mechatroner	3.7.0	mechatroner.rainbow-csv-3.7.0
vscode-dotnet-runtime	ms-dotnettools	1.7.1	ms-dotnettools.vscode-dotnet-runtime-1.7.1
vscode-guid	heaths	1.7.0	heaths.vscode-guid-1.7.0
vscode-print	pdconsec	0.11.15	pdconsec.vscode-print-0.11.15
vscode-todo-highlight	wayou	1.0.5	wayou.vscode-todo-highlight-1.0.5

Extension version: 2.0.413
VS Code version: Code 1.81.1 (6c3e3dba23e8fadc360aed75ce363ba185c49794, 2023-08-09T22:18:39.991Z)
OS version: Linux x64 6.4.9-1-MANJARO
Modes:

System Info

Item	Value
CPUs	12th Gen Intel(R) Core(TM) i7-1265U (12 x 4297)
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: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: disabled_off
Load (avg)	2, 2, 2
Memory (System)	31.06GB (22.34GB free)
Process Argv	--unity-launch /home/zeroskyx/skyseract/Libraries/skyseract.Hosting
Screen Reader	no
VM	0%
DESKTOP_SESSION	gnome
XDG_CURRENT_DESKTOP	GNOME
XDG_SESSION_DESKTOP	gnome
XDG_SESSION_TYPE	wayland

[dibarbet]

We probably just have the wrong classification for some of our folding regions - first place to debug is here - https://sourceroslyn.io/#Microsoft.CodeAnalysis.LanguageServer.Protocol/Handler/FoldingRanges/FoldingRangesHandler.cs,89