Add very slow query threshold to performance test report

Author: Robbie1977

.github/workflows/performance-test.yml

@@ -70,6 +70,7 @@ jobs:
           - **Fast queries**: < 1 second (SOLR lookups)
           - **Medium queries**: < 3 seconds (Owlery + SOLR)
           - **Slow queries**: < 10 seconds (Neo4j + complex processing)
+          - **Very Slow queries**: < 1200 seconds (Complex OWL reasoning - 20 minutes)
           
           ## Test Results