[TASK] Remove TSFE->clearPageCacheContent()

Internal TypoScriptFrontendController->clearPageCacheContent()
is removed without further notice.

Resolves: #102591
Releases: main
Change-Id: Ie626893b49fb260d4814abeb01d8125b66c7eba6
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82075


Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Stefan Bürk <stefan@buerk.tech>