interpreter: do not use pathlib in validate_within_subproject

pathlib's implementation of Path iteration is expensive;
"foo.parents" has quadratic complexity when building it:

        return self._path._from_parsed_parts(self._drv, self._root,
                                             self._tail[:-idx - 1])

and comparisons performed by "path in file.parents" potentially
have the same issue.  Use the newly introduced "is_parent_path"
function to check whether a file is under a path in the same way.
This removes Path from its hottest use.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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