[TASK] Avoid typehint docblocks for FunctionalTestCase properties

This patch removes docblock typehints for FunctionalTestCase
properties in functional tests, thus using the docblock type
hint of base class:

* $coreExtensionsToLoad
* $testExtensionsToLoad
* $pathsToLinkInTestInstance
* $pathsToProvideInTestInstance

This resolves a couple of issues from phpstan baseline.

> Build/Scripts/runTests.sh -s phpstanGenerateBaseline

Resolves: #96678
Releases: main, 11.5
Change-Id: If30529ac47f9cf329343154df96b7e6d63a23e00
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73202


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>