Make Kerberos support GA for Kafka output

[robbavey]

This is a placeholder issue to track the requirements to enable us to provide GA support for using Kerberos in the Kafka Output

• Support Kerberos Authentication with Microsoft Active Directory (given that the implementation was a direct port from the beats output, I am going to make the assumption that Kafka Kerberos authentication doesn't work with Active Directory beats#33334 is still an issue here)
• Add integration tests for Kerberos over Kafka beats#29430