[TASK] Avoid value decoding in `DataSet::import()`

[sbuerk]

TYPO3 v14 no longer converts values to database values when using Connection::insert(), which makes decoding values from CSV DataSet files an error.

One solution would be to pass the argument to enforce converting values again, which is used here.

This is possible since an early introduction of the method argument with [1] and becomes mandantory with [2] flipping the default value.

[1] https://review.typo3.org/c/Packages/TYPO3.CMS/+/89293 [2] https://review.typo3.org/c/Packages/TYPO3.CMS/+/90957

Releases: main