[Netskope] Add support to handle null values in ip field and handle failure in uri_parts processor applied on url

[darshan-elastic]

Problem statement:
Netskope events data is getting dropped when ip fields are having null values. When uri_parts processor is applied on url field and url field contains url without protocol in it, then data is getting dropped.

Describe the enhancement:
Data received from newer version of Netskope CLS, it is found that ip field are having null values because of which ip processor applied on that field is getting failed and so data is getting dropped. So there is a need to handle null values when received for the field source.ip, destination.ip and user.ip. There is a need to handle the failure in uri_parts processor when url field contains url without protocol in it.

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)