[TASK] Introspect acceptance testing

New runTests.sh option "-g" opens a tab in a local
browser pointing to http://localhost:7900/?autoconnect=1.
This allows watching acceptance tests clicking around.

Releases: main, 12.4, 11.5
Resolves: #101611
Change-Id: I53cbb861d7df6daac96dfcc382183f46847d7894
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80391


Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: Stefan B�rk <stefan@buerk.tech>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: Jochen Roth <rothjochen@gmail.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Jochen Roth <rothjochen@gmail.com>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Stefan B�rk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>