[TASK] runTests.sh: Show phpstan memory consumption

phpstan can be very memory hungry. Option --verbose
adds a line about 'peak memory' usage to the output.
Add this to get a better feeling of the memory usage.

Resolves: #104475
Releases: main, 12.4, 11.5
Change-Id: I3fdaf7ddee7e003e7a8e75a508dd69161c804c8d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85351


Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Mathias Brodala <mbrodala@pagemachine.de>
Tested-by: Oliver Bartsch <bo@cedev.de>