[FEATURE] Use paratest for composer script

This needs to be done for runTests.sh as well

Part of #1379

composer.json

@@ -47,6 +47,7 @@
 		"typo3/cms-frontend": "^11.5.4 || ^12.4.2"
 	},
 	"require-dev": {
+		"brianium/paratest": "^6.11",
 		"ergebnis/composer-normalize": "^2.43.0",
 		"friendsofphp/php-cs-fixer": "^3.60.0",
 		"helmich/typo3-typoscript-lint": "^3.1.1",
@@ -159,7 +160,7 @@
 		"ci:tests:create-directories": "mkdir -p .Build/public/typo3temp/var/tests",
 		"ci:tests:functional": [
 			"@ci:tests:create-directories",
-			"find 'Tests/Functional' -wholename '*Test.php' | parallel --gnu 'echo; echo \\\"Running functional test suite {}\\\"; .Build/bin/phpunit -c Build/phpunit/FunctionalTests.xml {}';"
+			"paratest -c Build/phpunit/FunctionalTests.xml Tests/Functional"
 		],
 		"ci:tests:unit": ".Build/bin/phpunit -c Build/phpunit/UnitTests.xml Tests/Unit",
 		"ci:ts:lint": "typoscript-lint -c Configuration/TsLint.yml --ansi -n --fail-on-warnings -vvv Configuration/TypoScript",