Nightly testing: remove edge testing from nightly pipelines

All of the edge tests are being ran on every nightly compose inside
virt-qe Jenkins so no need to run all of them here as well. Keep just
ostree-raw-image.sh to cover edge testing for sign-off.

.gitlab-ci.yml

@@ -297,7 +297,6 @@ OSTree:
   extends: .terraform/openstack
   rules:
     - !reference [.upstream_rules, rules]
-    - !reference [.nightly_rules, rules]
   script:
     - schutzbot/deploy.sh
     - /usr/libexec/tests/osbuild-composer/ostree.sh
@@ -343,6 +342,12 @@ OSTree simplified installer:
 OSTree raw image:
   stage: test
   extends: OSTree
+  rules:
+    # run only this edge test on nightly to have some testing for sign-off
+    # but still reduce duplication with virt-qe Jenkins and increase nightly
+    # pipelines stability
+    - !reference [.upstream_rules, rules]
+    - !reference [.nightly_rules, rules]
   script:
     - schutzbot/deploy.sh
     - /usr/libexec/tests/osbuild-composer/ostree-raw-image.sh

schutzbot/slack_notification.sh

@@ -4,7 +4,7 @@ set -eux
 
 COMPOSE_ID=$(cat COMPOSE_ID)
 COMPOSER_NVR=$(cat COMPOSER_NVR)
-MESSAGE="\"Nightly pipeline execution on *$COMPOSE_ID* with *$COMPOSER_NVR* finished with status *$1* $2 \n QE: @atodorov, @jrusz, @jabia, @xiaofwan\n Link to results: $CI_PIPELINE_URL \""
+MESSAGE="\"Nightly pipeline execution on *$COMPOSE_ID* with *$COMPOSER_NVR* finished with status *$1* $2 \n QE: @atodorov, @jrusz, @jabia\n Link to results: $CI_PIPELINE_URL\n For edge testing status please see https://url.corp.redhat.com/edge-pipelines \""
 
 curl \
     -X POST \