* Do not allow to delete an account if there are pending orders.

* When deleting an account do not remove WC account but disable it in
  practice by resetting password and setting contact email to LDH
  provided email.

* Also remove all PII in WC account, orders and subscriptions.

* delete_user CLI command also checks for pending orders before
  deleting an account.

Signed-off-by: Birin Sanchez <birin.sanchez@puri.sm>