Re: [Outreachy][PATCH] abspath: reconcile `dir_exists()` and `is_directory()`

Jeff King [off-list ref] writes:

Yeah, I think one path forward could be:

  - add path_exists(); this will work the same as file_exists(), but is
    a better name. Keep file_exists() for now, but put a comment that
    new calls should use path_exists().

  - use path_exists() in builtin/clone.c, ditching its custom
    dir_exists()

Both are of immediate value ;-)

  - (optional) start converting file_exists() calls to path_exists(),
    after confirming what each call wants (just files, or any path)

That is of lessor urgency but the result has a good documentation
value.