Tag build scans produced from running within IDEA

Author: breskeby

build-tools-internal/src/main/groovy/elasticsearch.build-scan.gradle

@@ -133,6 +133,9 @@ develocity {
         }
       } else {
         tag 'LOCAL'
+        if(providers.systemProperty('idea.active').present) {
+          tag 'IDEA'
+        }
       }
     }
   }