Developing in the Dart SDK repo checked out as a git worktree triggers unwanted "pub" runs

[DanTup]

See dart-lang/sdk#52067 (comment).

We're finding the git root by looking only for files, but in this case .git is a file.

[DanTup]

Should we change this check to only look for DEPS? See dart-lang/sdk#52067 (comment)