[TASK] Force integer for specific fields of site configuration

If the site config is saved through the site module the following fields
are saved as integer instead of a string:

- `languageId` of a language item
- `errorCode of an errorHandling item

This change makes it easier to lint the yaml configuration.

Resolves: #92510
Releases: master, 10.4
Change-Id: I3086a6c71a191ac1cbc0c14deadce3fa7fab5f5d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66076


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Josef Glatz <josefglatz@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Josef Glatz <josefglatz@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>