Synchronous event sent while a chain is being moved allowing plugins and Bamboo components to react on Chain key change.
While this event is being processed immutablePlanCacheService holds a lock on the original plan key.
This event is dispatched and delivered while the "move plan" database transaction is still in progress, allowing the
event listener to perform additional database operations in the same transaction (which will then be committed or
rolled back atomically).
Note that @AsynchronousPreferred annotation must not be used here