Add Zephyr Scale events to Listeners in ScriptRunner for Jira Cloud#32

ScriptRunner for Jira Data Center makes Zephyr Scale events available to its listeners per https://support.smartbear.com/zephyr-scale-server/docs/test-automation/integrations/creating-listeners-in-scriptrunner-for-events.html

Please provide the same functionality in ScriptRunner for Jira Cloud.