[TASK] Extend 'runTests.sh' to clean rendered documentation

This change adds the ability to clean rendered documentation
folder and files in all system extension folders in one go.
Mentioned folders are `typo3/sysext/*/Documentation-GENERATED-temp`.

Added command/testsuite:

* `Build/Scripts/runTests.sh -s cleanRenderedDocumentation`

Additionally the already combined cleaning command `-s clean`
is extended to delete rendered documentation in the same run.

Resolves: #97673
Releases: main, 11.5, 10.4
Change-Id: I344f897769cd5f475d43db67dd1b27693f49a658
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74842


Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>