[TASK] Improve core update error messages

Performing a core update in the install tool requires
a couple of checks, regarding directory structure
and permissions. On failure, the corresponding error
messages do now contain the information where to
check the directory status within the install tool.

Resolves: #91630
Releases: master, 10.4
Change-Id: I750203c61a0f697838f55b3fd114e5e2326e6df0
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/67506


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>