Fixes #11303

Proposed changes

Symbolic links in WSL cannot be accessed from Windows.
This adds some workarounds that makes it possible to open such repos,
that has been created for instance with Google's repo tool.

All access from Windows will fail, only access by WSL native like "wsl git" works.
At least the following do not work:

• Display of branch names for (mostly using .git/HEAD to get the name). wsl git can be used here.
• Git commands using Windows Git (like difftool from submenu with all tools) will fail. (Even listing of tools fail, for instance when closing settings).
• GE Settings cannot be read/write to local repo
• Commands using the local .git config will not work. This includes Commit, rebase etc

You can still view information and compare branches though
All issues will likely not be resolved, unless the filesystem in WSL is updated

I doubt linked git repos will be a common use for GE, so there should not be too many complaints.
WSL support in general is a hack.

Test methodology

Manual - basically impossible to test the actual problem

Merge strategy

I agree that the maintainer squash merge this PR (if the commit message is clear).

✒️ I contribute this code under The Developer Certificate of Origin.