Updating release docs (#12403)

Adding standard subject line to triage_replies.md

Removing PR commit generated change log in favor of github auto-commit log

Updating some images

Adding AWX matrix chanel to IRC notifications

Adding references between operator and AWX releases

.github/triage_replies.md

@@ -78,6 +78,8 @@ Thank you once again for this and your interest in AWX!
 - AWX-Operator: https://github.com/ansible/awx-operator/blob/devel/CONTRIBUTING.md
 
 ### AWX Release
+Subject: Announcing AWX X.Y.z
+
 - Hi all, \
 \
 We're happy to announce that the next release of AWX, version <X> is now available! \