[TASK] Avoid runTests.sh -o

Inline the 'random seed' option for -s unitRandom,
replay a specific seed using:

> runTests.sh -s unitRandom -- --random-order-seed=<number>

Resolves: #104131
Releases: main, 12.4, 11.5
Change-Id: I84e1cc0a0c57a5132a592a140d1b58ceb6d3b059
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84735


Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Garvin Hicking <gh@faktor-e.de>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>