[BUGFIX] Add rel="noreferrer" to all external links opened in new window

This patch defines "opening in a new window" as links having an attribute
`target` that is not either empty, `_self`, `_top` or `_parent`.

Resolves: #89771
Relates: #89757
Relates: #89044
Relates: #78488
Releases: master
Change-Id: I23f775f728b9ddfb25acd306b653cbfbb6eeba51
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62430


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Jörg Bösche <typo3@joergboesche.de>
Tested-by: Susanne Moog <look@susi.dev>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Tobi Kretschmann <tobi@tobishome.de>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Jörg Bösche <typo3@joergboesche.de>
Reviewed-by: Benni Mack <benni@typo3.org>