[TASK] Use generators for service objects in Authentication

The introduction of the Session Framework API in v8
introduced generators for fetching authentication service
objects within `AbstractUserAuthentication`.

Some places were however forgotten, which can
safely replaced with the `$this->getAuthServices()`
method.

Resolves: #88594
Releases: master
Change-Id: I987150be574232b549340f4766bb963baa17fd60
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/61095


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Alexander Schnitzler <review.typo3.org@alexanderschnitzler.de>
Tested-by: Daniel Gorges <daniel.gorges@b13.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Alexander Schnitzler <review.typo3.org@alexanderschnitzler.de>
Reviewed-by: Daniel Gorges <daniel.gorges@b13.de>
Reviewed-by: Benni Mack <benni@typo3.org>