Remove the cert cleanup code
Remove the cert cleanup code

These certs have been removed from `cf-vars-store.yml` and as a result this code is no longer required.

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf