populate: refer to flakes as git+file: only with a usable .git

Writing the lock file of a git+file: flake, Nix runs Git, with the
repository's configuration and hooks, which may run commands.  A .git
in a source's directory can come from anywhere, e.g. one planted in a
materialized flake, or one a file source keeps.  So drawing inputs
refers to a flake as git+file: only if git_problems finds nothing wrong
with its .git directory, the way git sources check their work trees,
and else as path:.

lock-foreign-git plants a .git in a materialized flake and in a file
source that keeps it, whose configuration names an fsmonitor command.

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