fixes #70081
fixes #75240

This reverts commit fdb1c37b.

Remove part of the regex matching expression for git commits, because previous it would think commits with empty messages were invalid when infact they are not

Try naiive rev-parse for branches beginning with @ to see if they resolve, before replacing with symbolic full name version.

Update extensions/git/src/api/git.d.ts

Fix another typo

Fix some typo