getRepositories taking a lot of CPU when opening a folder with 20000 files in root

[Tyriar]

Repro:

1. Windows
2. Open an empty temp window
3. Run in pwsh: 1..20000 | ForEach-Object { [System.IO.File]::Create("d:\Playground\many_files\file$_.txt").Dispose() }
4. Open terminal and type ./ (maybe not needed)

Trace: vscode-profile-2025-12-10-08-57-34.cpuprofile