packit: Disable copr failure messages

It's too spammy.

Signed-off-by: Colin Walters <walters@verbum.org>

Author: cgwalters

.packit.yaml

@@ -59,10 +59,6 @@ jobs:
     owner: rhcontainerbot
     project: bootc
     enable_net: true
-    # TODO
-    notifications:
-      failure_comment:
-        message: "bootc Copr build failed for {commit_sha}. @admin check logs {logs_url} and packit dashboard {packit_dashboard_url}"
 
   - job: tests
     trigger: pull_request