This change changes extbase persistence tests to use CSV files
where suitable.

The `addSimpleObjectTest` has been removed, since
`addObjectSetsDefaultLanguageTest` also tests, if a simple object
can be added.

Additionally, one test is moved from `AddTest.php` to
`UpdateTest.php`, because this test actually tests an update-
scenario instead of an add-scenario.

Resolves: #103668
Releases: main
Change-Id: I4b95a8f6f28be17d50f9f2b88f005a7f02248322
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84153


Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: core-ci <typo3@b13.com>