Application Gateway V2 with Key Vault: Not able to provide certificate in single line pem format

101-application-gateway-key-vault-create

### Issue Details
Not able to import Keyvault ssl certificate in pem format as its in multiline. If i try to make it one line it does not support at all.
Not sure how u able to import to keyvault

Start with the 101-application-gateway-key-vault-create template and reproduce the certificate import using the Azure Application Gateway and Key Vault documentation. Confirm the supported PEM format and identify whether the template or its documentation needs a change; done means the supported certificate input works or the limitation is clearly documented.

Written by the indexing model from the issue text.