Redis exporter enabled label

[Leo791]

Is your feature request related to a problem? Please describe.

When enabling redis exporter no new label is set which could be used for scraping.

Describe the solution you'd like

A simple label, such as redis.opstreelabs.monitoring: "true" could be added when the exporter is added to the setup to make scraping easier

What version of redis-operator are you using?

redis-operator version: v0.18.0