[TASK] Stop runtime caching GU::trimExplode() in DH

There is no point to substitute GU::trimExplode() of
the rather short TCA 'eval' string by substituting
it with an md5() operation plus runtime cache object
operations.

Both things are most likely similarily quick, and
the time consumed by queries in DH is multiple orders
of magnitude bigger than this simple operation, a
difference is not measurable.

Let's thus simplify the code a bit.

Resolves: #103125
Releases: main, 12.4
Change-Id: I474d3fbe6b503a99a9129856b0f59c777b171844
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82977


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>