From mmcneill@redhat.com - we should remove #hcm-sre-platform as a channel people can select in WebRCA.

"any chance we could disable the ability to use the #hcm-sre-platform as an incident channel? It happens on a pretty regular basis where someone accidentally checks the wrong box and it messes all kinds of things up."

Slack thread: https://redhat-internal.slack.com/archives/C07MAS9DZCM/p1736218723786239