Thanks so much for your reply!
Is it possible that the last time SonarLint was updated was a few years ago? Because it looks like the binding configuration is from SonarLint 4.0 > which we released back in 2018.
Unfortunately, our migration does not support cleaning up legacy files.
Instead of migrating what I can advise you to do is delete all Sonarlint files from your project (the SonarQube Folder and Csharp Folder) and then make a fresh binding.
This link will show you a walkthrough of how to do so.
Please mind the changes might affect the way you previously dealt with connected mode as the new binding will write all files to %AppData%\Roaming\SonarLint for Visual Studio\Bindings instead of your solution folder.
Please let me know if this helps! 