[!!!][TASK] Use no-cookie domain for youtube by default

Improve the privacy of users by using the no-cookie domain of youtube
by default and just use youtube.com if explicitly set.

Resolves: #84843
Releases: master, 8.7, 7.6
Change-Id: I01472f93e32c2011b5494c4670d07f29348016c3
Reviewed-on: https://review.typo3.org/56880


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Jan Helke <typo3@helke.de>
Tested-by: Jan Helke <typo3@helke.de>
Reviewed-by: Frans Saris <franssaris@gmail.com>
Reviewed-by: Daniel Sattler <sattler@b13.de>
Tested-by: Daniel Sattler <sattler@b13.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Guido Schmechel <guido.schmechel@brandung.de>
Tested-by: Guido Schmechel <guido.schmechel@brandung.de>