[TASK] Merge phpunit setup files to Build/phpunit
typo3/testing-framework ships default .xml and bootstrap files for phpunit unit and functional tests. They are however quite hard to maintain since the testing-framework supports multiple core versions at once, but core occassionally needs version specific settings. The patch copies the files from the testing-framework to Build/phpunit and adapts core usages. The files within testing-framework will be kept, but will receive an additional "these are boilerplates, consider copying them to your extension" hint for extension developers. The local .xml files are now: * Compatible with phpunit 9 * Let tests fail if phpunit marks a test with warning. With this enabled, we would have seen the issues fixed with #94724 and #94723 with initial #94706 already. Good to do that now. Resolves: #94725 Related: #94706 Related: #94723 Related: #94724 Releases: master Change-Id: I9fef75a972759d26d4e0e3286142cacf181c33d2 Reviewed-on: https://review.typo3.org/c/Pack...