[FEATURE] Add additional configuration for external URLs

Additional configuration is added to customize settings for checking
external URLs.

Resolves: #86918
Related: #89287
Releases: master
Change-Id: I1ebfb31fe7760ad5b7c99db3999794c1e363cd17
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/61801


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Chris Müller <typo3@krue.ml>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Chris Müller <typo3@krue.ml>
Reviewed-by: Benni Mack <benni@typo3.org>