DEVX-2783: increase sleep before ksqldb queries from 30s to 60s. (#1188)

* DEVX-2783: increase sleep before ksqldb queries from 30s to 60s.

Prior to this change, ksqlDB queries were failing fairly often due to connectors not yet registering a schema.

* Updated printf to match sleep 60.

Author: javabrett

cp-quickstart/start-cloud.sh

@@ -81,8 +81,8 @@ ccloud::create_connector connectors/ccloud-datagen-pageviews.json || exit 1
 ccloud::create_connector connectors/ccloud-datagen-users.json || exit 1
 ccloud::wait_for_connector_up connectors/ccloud-datagen-pageviews.json 300 || exit 1
 ccloud::wait_for_connector_up connectors/ccloud-datagen-users.json 300 || exit 1
-printf "\nSleeping 30 seconds to give the Datagen Source Connectors a chance to start producing messages\n"
-sleep 30
+printf "\nSleeping 60 seconds to give the Datagen Source Connectors a chance to start producing messages\n"
+sleep 60
 
 printf "\n====== Setting up ksqlDB\n"