[BUGFIX] Load uncached site configuration in editAction

By loading the uncached site configuration, no direct
changes to the configuration files are overridden when
using the Site management module.

Resolves: #89492
Releases: master, 9.5
Change-Id: I4ef3ac08692e709fc2953bc17b5759d6f55f463f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62090


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Steffen Frese <steffenf14@gmail.com>
Tested-by: Sascha Rademacher <sascha.rademacher+typo3@gmail.com>
Tested-by: Henning Liebe <h.liebe@neusta.de>
Tested-by: Susanne Moog <look@susi.dev>
Reviewed-by: Steffen Frese <steffenf14@gmail.com>
Reviewed-by: Sascha Rademacher <sascha.rademacher+typo3@gmail.com>
Reviewed-by: Henning Liebe <h.liebe@neusta.de>
Reviewed-by: Susanne Moog <look@susi.dev>