[TASK] Unify spelling of page TSconfig

Some specific TYPO3 terms have a special spelling. Therefore
update the spelling from "PageTsConfig" to "page TSconfig"
and "UserTsConfig" to "user TSconfig" as once defined here:
https://docs.typo3.org/m/typo3/docs-how-to-document/main/en-us/GeneralConventions/Glossary.html

Resolves: #99856
Releases: main
Change-Id: I37d280a8c8a35bf8737eb2f694f1101fb8645783
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77725


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>