[TASK] Move target to general tab for pages of type External URL

To increase usability for editors when using External URL links,
the "target" field is moved right below the "Target URL" field.

In addition the Target URL field has an increased size, to match
the others.

Resolves: #79317
Releases: master
Change-Id: I9aec38780713df006f98be370e4fadd5c61118aa
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62633


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Riccardo De Contardi <erredeco@gmail.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Riccardo De Contardi <erredeco@gmail.com>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>