[TASK] Remove todo for intExplode function in GeneralUtility

A todo for the `intExplode` function suggests to refactor the method
by using `array_filter` and `array_walk`. This refactoring would
however result in more code and slower performance.

The todo is therefore removed, as the function is good as it is.

Resolves: #102877
Releases: main
Change-Id: Ib945e010532d0ec5df14be698651197311eea809
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82534


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