Updates for metrics URL settign and checking

[ddonahue007]

This PR changes the following:

• add ability to change scheme for METRICS_PUSH_GATEWAY

• move enable metrics log message
  The following is seen in the logs even when metrics is disabled:

{"level":30,"time":1711990810254,"pid":1,"hostname":"remediations-consumer-cleaner-28533180-mlrfg","name":"remediations-consumer","type":"application","msg":"metrics sent","v":1}

The change is to move the log message, logging the above only when metrics are truly sent, and when pushing metrics is false, log a message to that effect.