Handle symlinks to outside of project root better

[amyreese]

(all) amethyst@luxray ~/workspace/fixit main± ‹1› » fixit lint .
(PosixPath('.'),)
Traceback (most recent call last):
  File "/Users/amethyst/Library/Application Support/hatch/env/virtual/fixit/OQ5NT6ov/all/bin/fixit", line 10, in <module>
    sys.exit(main())
  File "/Users/amethyst/Library/Application Support/hatch/env/virtual/fixit/OQ5NT6ov/all/lib/python3.10/site-packages/click/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
  File "/Users/amethyst/Library/Application Support/hatch/env/virtual/fixit/OQ5NT6ov/all/lib/python3.10/site-packages/click/core.py", line 1055, in main
    rv = self.invoke(ctx)
  File "/Users/amethyst/Library/Application Support/hatch/env/virtual/fixit/OQ5NT6ov/all/lib/python3.10/site-packages/click/core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/Users/amethyst/Library/Application Support/hatch/env/virtual/fixit/OQ5NT6ov/all/lib/python3.10/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/Users/amethyst/Library/Application Support/hatch/env/virtual/fixit/OQ5NT6ov/all/lib/python3.10/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
  File "/Users/amethyst/Library/Application Support/hatch/env/virtual/fixit/OQ5NT6ov/all/lib/python3.10/site-packages/click/decorators.py", line 26, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/Users/amethyst/workspace/Fixit/src/fixit/cli.py", line 96, in lint
    for result in fixit_paths(paths):
  File "/Users/amethyst/workspace/Fixit/src/fixit/api.py", line 180, in fixit_paths
    expanded_paths.extend(trailrunner.walk(path))
  File "/Users/amethyst/Library/Application Support/hatch/env/virtual/fixit/OQ5NT6ov/all/lib/python3.10/site-packages/trailrunner/core.py", line 185, in gen
    yield from gen(child.iterdir())
  File "/Users/amethyst/Library/Application Support/hatch/env/virtual/fixit/OQ5NT6ov/all/lib/python3.10/site-packages/trailrunner/core.py", line 176, in gen
    relative = child.resolve().relative_to(root)
  File "/Users/amethyst/.pyenv/versions/3.10.6/lib/python3.10/pathlib.py", line 818, in relative_to
    raise ValueError("{!r} is not in the subpath of {!r}"
ValueError: '/Users/amethyst/Library/Application Support/hatch/env/virtual/fixit/OQ5NT6ov/all' is not in the subpath of '/Users/amethyst/workspace/Fixit' OR one path is relative and the other is absolute.