[TASK] Streamline IS Indexer->createLocalPath()

Make the calls to sub methods explicit and add
type hints.

Resolves: #102912
Releases: main
Change-Id: I6d1ff6dbcfd6f0df375f7d87f85a1563b92ceaec
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82610


Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Andreas Kienast <a.fernandez@scripting-base.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>