Specific files.exclude breaks file scanning workspace.library

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### Which OS are you using?

Windows

### Expected Behaviour

When I specify the complicated mask of editor's `files.exclude` ugh... because there is no other way https://github.com/microsoft/vscode/issues/869
```jsonc
"files.exclude": {
"**/?*.[!l]*": true,
"**/?*.l[!u]*": true,
"**/?*.lu[!a]*": true,
"**/?*.lua?*": true
},
```
I expect to exclude all files from the VS Code project except `.lua`, so this should not affect the plugin in any way.

### Actual Behaviour

I see that LuaLS file scanning is starting to work incorrectly, it may selectively skip my libraries from `Lua.workspace.library` list.

### Reproduction steps

1. Setup Multi-root Workspaces project https://code.visualstudio.com/docs/editor/multi-root-workspaces
for example our file located in `proj/data/game/.vscode`
```jsonc
// relative to proj/data/game/.vscode
"folders": [
{
"path": ".." // proj/data/game
},
{
"path": "../../scripts" // proj/data/scripts
},
{
"name": "system_data/game",
"path": "../../../system_data/game" // proj/system_data/game
},
{
"name": "system_data/scripts",
"path": "../../../system_data/scripts" // proj/system_data/scripts
}
],
```
2. Setup `Lua.workspace.library` for correct Multi-root Workspaces file scanning
```jsonc
"Lua.workspace.library": [
"../../data/game",
"../../data/scripts",
"../../system_data/game",
"../../system_data/scripts",
".vscode/library" // some meta definitions in `proj/data/game/.vscode`
],
```
3. Everything works fine. Then setup editor's files mask
```jsonc
"files.exclude": {
"**/?*.[!l]*": true,
"**/?*.l[!u]*": true,
"**/?*.lu[!a]*": true,
"**/?*.lua?*": true
},
```
4. Now some annotations are missing or the files just haven't been loaded.

### Additional Notes

_No response_

### Log

_No response_

Reproduce the Windows multi-root workspace scenario using the shown files.exclude and Lua.workspace.library settings. Start by tracing the VS Code extension's workspace file-scanning path and compare results with and without files.exclude. Done means all configured library paths are scanned consistently and the missing annotations or unloaded files no longer occur.

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