Add nodeSelector to cluster initialize pod

[ThelonKarrde]

Fixes #

Motivation

Add an option to choose where to run pulsar-cluster-initialize pod. Sometimes there is a necessity to run only on certain nodes.

Modifications

Added nodeSelector option to the pulsar-cluster-initialize job.

Verifying this change

• [ ] Make sure that the change passes the CI checks.

[ThelonKarrde]

@MarvinCai @michaeljmarshall pinging here since you potentially might be the right persons to review it

[ThelonKarrde]

@MarvinCai @michaeljmarshall ping here again

[ThelonKarrde]

@michaeljmarshall indeed I pushed the wrong changes. Thank you for the fix. It works locally. Also pushed a fix for typo in values description