chore(test): extend sleep duration for starting single node (#20118)

Author: cyliu0

ci/scripts/run-e2e-test.sh

@@ -46,7 +46,7 @@ cluster_start() {
     risedev pre-start-dev
     start_single_node "$PREFIX_LOG"/single-node.log &
     # Give it a while to make sure the single-node is ready.
-    sleep 10
+    sleep 30
   else
     risedev ci-start "$mode"
   fi

ci/scripts/run-meta-backup-test.sh

@@ -45,7 +45,7 @@ cluster_start() {
     risedev pre-start-dev
     start_single_node "$PREFIX_LOG"/single-node.log &
     # Give it a while to make sure the single-node is ready.
-    sleep 3
+    sleep 30
   else
     risedev ci-start "$mode"
   fi