fs: use validateBoolean() in rm/rmdir validation

PR-URL: https://github.com/nodejs/node/pull/35565


Reviewed-By: Ben Coe <bencoe@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Masashi Hirano <shisama07@gmail.com>