MULE-6874: Memory leak with dynamic endpoints

_Avoinding registering static endpoints created when resolving the dynamic endpoint for a given event
_NOTE: hard to add a test for this issue. Test the change using the app attached to the JIRA
(cherry picked from commit cd32a4e)
(cherry picked from commit b6e5004)
(cherry picked from commit 9c0ba81)
(cherry picked from commit 72eb236)