[v18.x backport] fs: introduce `dirent.parentPath`

[aduh95]

The goal is to replace dirent.path using a name that's less likely to create confusion. dirent.path value has not been stable, moving it to a different property name should avoid breaking some upgrading user expectations.

PR-URL: https://github.com/nodejs/node/pull/50976 Reviewed-By: Ethan Arrowood [email protected] Reviewed-By: LiviaMedeiros [email protected]