MULE-7742 Thread Safety issues in one of the constructors of default mule session.
Merge pull request #832 from vromero/dev/vromero/bug/MULE-7742

SE-988 Thread Safety issues in one of the constructors of default mule s...
MULE-7620 - Removing lax from endpoint. Adding MessagingExceptionHandlerAware interface for exception handler injection
Changes to migration guide and interface documentation according to PR comments.
Migration guide fix.
Merge pull request #833 from mulesoft/MULE-7620

MULE-7620 - Removing lax from endpoint. Adding MessagingExceptionHandler...
Revert "MULE-7742 Thread Safety issues in one of the constructors of default mule session."

This reverts commit c25c8ae3ea02166828f7c81851ab5381286971da.