[chore](ci) add isCloudMode (#37518)

## Proposed changes

Issue Number: close #xxx

<!--Describe your changes.-->

Co-authored-by: stephen <hello-stephen@qq.com>

regression-test/framework/src/main/groovy/org/apache/doris/regression/suite/Suite.groovy

@@ -1329,4 +1329,8 @@ class Suite implements GroovyInterceptable {
         }
     }
 
+    boolean isCloudMode() {
+        return false
+    }
+
 }