Don't use KubernetesRuntimeFactory because it doesn't work

[pgier]

Currently the operator set this in functions_worker.conf by default. This should not be set because it doesn't work.

functionRuntimeFactoryClassName: org.apache.pulsar.functions.runtime.kubernetes.KubernetesRuntimeFactory

The problem is that when this is enabled, it causes an incorrect pulsar admin url to be used in the generated connector pod.

Related: apache/pulsar#9213

[nicoloboschi]

@pgier that problem has been resolved in Pulsar 2.8.
do you still have the issue?

[pgier]

Yes, I experienced this issue in 2.10. I didn't test with other versions.
The workaround was to manually set functionRuntimeFactoryClassName to an empty string.