branch-2.1: [opt](regression-test) Adjust the stream load timeout check of the regression framework #47037 (#47049)

cherry pick from #47037

regression-test/framework/src/main/groovy/org/apache/doris/regression/action/StreamLoadAction.groovy

@@ -343,10 +343,12 @@ class StreamLoadAction implements SuiteAction {
 
             if (time > 0) {
                 long elapsed = endTime - startTime
-                try{
-                    Assert.assertTrue("Expect elapsed <= ${time}, but meet ${elapsed}", elapsed <= time)
+                try {
+                    // stream load may cost more time than expected in regression test, because of case run in parallel.
+                    // So we allow stream load cost more time, use 3 * time as threshold.
+                    Assert.assertTrue("Stream load Expect elapsed <= 3 * ${time}, but meet ${elapsed}", elapsed <= 3 * time)
                 } catch (Throwable t) {
-                    throw new IllegalStateException("Expect elapsed <= ${time}, but meet ${elapsed}")
+                    throw new IllegalStateException("Stream load Expect elapsed <= 3 * ${time}, but meet ${elapsed}")
                 }
             }
         }