[TASK] runTests.sh: Allow to execute phpstan sub-set

Allow a call like
Build/Scripts/runTests.sh -s phpstan typo3/sysext/linkvalidator

Change-Id: Ic7bdc943ab203b34b8710bf95468b9335c6e31ae
Resolves: #93710
Release: master, 10.4
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68357


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>

Build/testing-docker/local/docker-compose.yml

@@ -1117,7 +1117,7 @@ services:
           set -x
         fi
         mkdir -p .cache
-        bin/phpstan analyse --no-progress --no-interaction --memory-limit 4G
+        bin/phpstan analyse --no-progress --no-interaction --memory-limit 4G ${TEST_FILE}
       "
 
   unit: