[BUG] - Can't load mods if the game folder has BepInEx installed

[AtomicTyler1]

Describe the bug
Currently if the game folder already had bepinex installed, the mod manager will not load the gaem with mods. This is an issue I'm seeing with people forgetting to delete their manual install attempts after switching to a mod manager. I am not effected, however for the ease of giving support this bug (or intended feature) should hopefully be fixed/removed.

To Reproduce
Steps to reproduce the behavior:

1. Manually add bepinex to the game folder
2. Try to launch modded

Expected behavior
What I think should happen is quite simple:

1. Detect if the game folder contains any form of BepInEx folder
2. Give the user the following options:
   • Launch with manually installed mods
   • Tell the user to manually remove the folder
   • Add a button to remove the bepinex files for them

Technically speaking, this system could be re-used into a new feature, but this being a bug report I'll keep it short; when running vanilla tell the user than because bepinex is manually installed it still wont be vanilla.

Screenshots
Self explaintory, no screenshots are needed

Additional context
This is a common issue I face with supporting members of the PEAK community, we tell them to switch to a mod manager and they forget to uninstall manual attempts.

[ebkr]

This is something that BepInEx should deal with. The most likely cause it usually an incorrect game directory set in the mod manager, but the manual install already has the files in place, so when the start modded action is done, the fallback is the manual BepInEx install.

If there's no mods appearing entirely then that's weird?

Either way, I don't think this is something that we overly want to handle because people often have a mod manager profile and a manual install for local development. We could maybe add a notification but for the most part it's an extremely uncommon setup and could just end up being annoying.