I got the same error on my vs code. Well this happens when you have initialized .git in a higher level folder.
Ways to solve it:

1. Through file explorer (windows/mac)

   • locate the folder that has the 10k commit issue on your file explorer

   • keep looking for .git folder in the parent folders

   • if found, delete the .git folder

2. Through VS Code Terminal (Hard Way)

   • open terminal in vs code using ctrl+`

   • first locate to your folder which has 10k commits issue eg: cd "C:/Windows/Deepanshu/Projects/IssueFolder"

   • once reached use command: cd .. (to go to parent folder) and the ls (to check the list of folders and files the current folder)

   • once the .git folder is found, delete it using the command: rm ".git"

(this is my first answer in stackoverflow, I hope it solves the problem)