Disable Kibana checks for 8.x branches (#3857)

Since we're testing against Kibana main, using 8.x branches is not going to
work. If needed, in the future, we can test Kibana 8.x against branch 8.x of
the Elasticsearch specification.

Author: pquentin

catalog-info.yaml

@@ -43,15 +43,3 @@ spec:
           branch: 'main'
           cronline: '0 4 * * *'
           message: 'Daily run for main branch'
-        Daily 8.x:
-          branch: '8.x'
-          cronline: '0 4 * * *'
-          message: 'Daily run for 8.x branch'
-        Daily 8.17:
-          branch: '8.17'
-          cronline: '0 4 * * *'
-          message: 'Daily run for 8.17 branch'
-        Daily 8.18:
-          branch: '8.18'
-          cronline: '0 4 * * *'
-          message: 'Daily run for 8.18 branch'