Log when entering and exiting task exclusive mode
requested to merge 3137-create-new-log-messages-when-entering-and-exiting-exlusive-task-mode into main
The task exclusive mode stops all processing (tasks and networking IO) except the designated exclusive task events. This has impact on the operation of the server. Add log messages indicating when we enter the exclusive mode, when we exit exclusive task mode.
Closes #3137 (closed)