mini_diff should be configurable to ignore files under VCS (avoid GitGutter conflict)

[eugenesvk]

Problem description

mini_diff is a cool feature, but conflicts with GitGutter. Currently you can disable mini_diff in non-VCS managed files per #2593, but can't disable it only in VCS managed files so that you can use GitGutter for VCS files and mini_diff elsewhere without any conflict

Preferred solution

Add a "mini_diff": "nonvcs", option that would only disable builtin minidiff in VCS-managed files, but leave it for regular files

Alternatives

n/a

Additional Information

No response