[Regression](inverted index) fix build index case for cloud mode (apa…

…che#37962)

## Proposed changes

Build index is not support in cloud mode.
Fix the cases.

regression-test/suites/inverted_index_p0/index_change/test_add_drop_index_on_table_with_mv.groovy

@@ -128,8 +128,9 @@ suite("test_add_drop_index_on_table_with_mv") {
     assertEquals(show_result[0][2], "idx1")
 
     // build index
-    sql """ BUILD INDEX idx1 ON ${tableName}; """
-
-    // wait for index build finish
-    wait_for_build_index_on_partition_finish(tableName, timeout)
+    if (!isCloudMode()) {
+        sql """ BUILD INDEX idx1 ON ${tableName}; """
+        // wait for index build finish
+        wait_for_build_index_on_partition_finish(tableName, timeout)
+    }
 }

regression-test/suites/inverted_index_p0/index_change/test_add_drop_index_repeatly.groovy

@@ -70,10 +70,12 @@ suite("test_add_drop_index_repeatly"){
     for (def i = 1; i <= 10; i++) {
         // create index on table 
         sql """ create index idx_k2 on ${tbl}(k2) using inverted """
-        // build index 
-        sql """ build index idx_k2 on ${tbl} """
-        def state = wait_for_last_build_index_on_table_finish(tbl, timeout)
-        assertEquals(state, "FINISHED")
+        if (!isCloudMode()) {
+            // build index
+            sql """ build index idx_k2 on ${tbl} """
+            def state = wait_for_last_build_index_on_table_finish(tbl, timeout)
+            assertEquals(state, "FINISHED")
+        }
         sql """ drop index idx_k2 on ${tbl} """
     }
 }