Add serviceMonitor field to Helm values.schema.json

[lillykwasn]

Description

Completed bug fix for: Helm chart values schema is missing an entry for the serviceMonitor property. #4860

serviceMonitor property was added to the helm chart

Fixes #4860
#4860

Checklist

• Unit tests updated
• End user documentation updated

[linux-foundation-easycla]

• ✅login: lillykwasn / (7cdab79)

The committers listed above are authorized under a signed CLA.

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[stevehipwell]

Thanks for the PR @lillykwasn but this schema doesn't contain all of the chart values for serviceMonitor which AFAIK would result in this change breaking the chart.