[TASK] Avoid unnecessary database snapshot in two test-cases

Two functional tests use the testing-framework db snapshot
feature without really needing it. Those can be simplified.

This patch removes the `withDatabaseSnapshot()` usage, and
cleans one test which fails to free an only partially
fetched db result set, which otherwise leads to fails with
sqlite.

Resolves: #97932
Releases: main
Change-Id: I52d97000c1e8129bc0faa601d990e5274f416d4f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75171


Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>