[TASK] Improve duplicate exception code check

* better regex finds more with less false positives
* use grep instead of ack-grep
* find exceptions without exception code
* the script kills travis for unkown reasons and removed

Change-Id: I6ae7c005bc9f493365d36f9602aebf389f1f7786
Resolves: #78221
Releases: master
Reviewed-on: https://review.typo3.org/50150


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>