in serviceMonitor add metricRelabelings & relabelings, fix labels

[smartbit]

Overview

fix & enhance serviceMonitor

What this PR does / why we need it

in serviceMonitor

• fix indent for labels
• add metricRelabelings: and in comments add sample to be able to recognize the metrics
• add relabelings: for those who want them

Special notes for your reviewer

Updated Chart to v0.8.2, please push the appropriate version to https://charts.dexidp.io

Checklist

• [ ] Change log updated in Chart.yaml (see the contributing guide for details)
• [x] Chart version bumped in Chart.yaml (see the contributing guide for details)
• [ ] Documentation regenerated by running make docs