[BUGFIX] Fix scheduler task logging in case of an exception

Correctly log the message if a Scheduler task throws an exception.
The exception code is now part of the logged message too.

Resolves: #80566
Releases: master, 7.6
Change-Id: Ic4eb25608094869733b4a23057d209fab1a1bccf
Reviewed-on: https://review.typo3.org/52286


Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Thomas Hohn <thomas@hohn.dk>
Tested-by: Thomas Hohn <thomas@hohn.dk>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>