fs: fix infinite loop with async recursive mkdir on Windows

If `file` is a file then on Windows `mkdir` on `file/a` returns an
`ENOENT` error while on POSIX the equivalent returns `ENOTDIR`. On the
POSIX systems `ENOTDIR` would break out of the loop but on Windows the
`ENOENT` would strip off the `a` and attempt to make `file` as a
directory. This would return `EEXIST` but the code wasn't detecting
that the existing path was a file and attempted to make `file/a` again.

PR-URL: https://github.com/nodejs/node/pull/27207
Fixes: https://github.com/nodejs/node/issues/27198


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Ben Coe <bencoe@gmail.com>