[Backport 2.x] Inject namedWriteableRegistry during ser/deser of SearchMonitorAction (#1382)#1384

lezzago merged 3 commits intoopensearch-project:2.xopensearch-project/alerting:2.xfrom

ohltyler:search-monitors-fix-2xohltyler/alerting:search-monitors-fix-2xCopy head branch name to clipboard