[v10.3.x] Chore: Remove grafana-delivery references (#82537)

Chore: Remove `grafana-delivery` references (#82505)

* s/grafana-delivery/grafana-release-guild/g

* Remove -squad suffix

(cherry picked from commit a6bc262093)

.github/workflows/pr-patch-check.yml

@@ -1,4 +1,4 @@
-# Owned by grafana-delivery-squad
+# Owned by grafana-release-guild
 # Intended to be dropped into the base repo Ex: grafana/grafana
 name: Check for patch conflicts
 run-name: check-patch-conflicts-${{ github.base_ref }}-${{ github.head_ref }}