[FEATURE] Possibility to disable hreflang per page

If you have a good reason to disable the default rendering of
hreflang tags, you can now use a TypoScript setting.

To disable the hreflang generation, you can add the following
line to your TypoScript setup.

.. code-block:: typoscript

   config.disableHrefLang = 1

Resolves: #93188
Releases: master
Change-Id: I7678b395e4c2bfd6a62a87c928b3f8a44af381ec
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/67930


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Guido Schmechel <guido.schmechel@brandung.de>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Jörg Bösche <typo3@joergboesche.de>
Reviewed-by: Guido Schmechel <guido.schmechel@brandung.de>
Reviewed-by: Torben Hansen <derhansen@gmail.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>