[BUGFIX] Prevent null pointer exception in ContentObjectRenderer

The $request might not be initialized, that's
why the getRequest() method has to be used in
ContentObjectRenderer.

This is now done for newly introduced occurrences,
accessing the class property directly.

Resolves: #103407
Releases: main
Change-Id: I466f31316b2885132288cbc8745f3dc4760bdcf2
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83497


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Benjamin Franzke <ben@bnf.dev>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Benni Mack <benni@typo3.org>