Respect telemetry readers metrics endpoint on monitoring port

[shuheiktgw]

Description:
Updated the code to use .spec.config.service.telemetry for the monitoring port. Thanks for the review!

Link to tracking Issue(s):

• Resolves: Monitoring service ignores .spec.config.service.telemetry config for new metrics readers config #4049
• Resolves: Service telemetry address is not exposed on the collector pod and collector-monitoring service #4233

Testing:

Documentation:

[swiatekm]

LGTM. We should document how this works exactly, as right now we only expose the port from the first metrics reader. That can happen in a follow-up though.