neo4j-admin: Add support for custom labels on Jobs created by CronJob

[mreimbold]

Is your feature request related to a problem? Please describe.
Currently, the neo4j-admin/templates/neo4j-cronjob.yaml template does not provide a way to add custom labels to the Jobs created by the CronJob. This makes it difficult to identify or manage these Jobs in environments where label-based automation or monitoring is used.

Describe the solution you'd like
I would like the Helm chart to support setting additional labels for the Jobs created by the CronJob. This could be implemented by adding a neo4j.jobLabels value (or similar) to values.yaml, which is then injected into the Job template under metadata.labels.

[bfeshti]

@mreimbold We have discussed this internally and converted it into a feature request, it will be released with the upcoming releases.