Fixes EISDIR corrective action creating new EISDIR errors later

[AaronFeledy]

Fixes this error I ran into:

Error: EISDIR: illegal operation on a directory, unlink '/home/aaron/.lando/config/pantheon/drupal10.conf.tpl'

Seems some error case gets checked to see if a directory can be created. This is problematic if the f getting passed to mkdir is a file name. When there is now a directory with the path and name of one of our files, subsequent runs of this function will attempt to put the file where there is now a directory with the same name. It breaks because unlinking a directory is not possible.

I added a function to remove the directory that got created during the mkdir in the conditional above it. It's equivalent to an rm -rf so it won't throw a new error if f doesn't exist.

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[AaronFeledy]

lando/lando#2051