[TASK] Replace inline JavaScript in AbstractPlugin

Remaining individual inline JavaScript in `onclick` handler to open
an URI in a new window is replaced with default frontend JavaScript
(see #95041) in `AbstractPlugin::pi_openAtagHrefInJSwindow()`.

Resolves: #95151
Releases: master
Change-Id: I90e12d521efaf1a0ac0be0890c940f20b832aa21
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70968


Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Benjamin Franzke <bfr@qbus.de>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benjamin Franzke <bfr@qbus.de>