[TASK] Remove predefined Linkvalidator sender mailaddress

In production environments the address is always wrong. By removing it the fallback MAIL/defaultMailFromAddress is used.

With this it's possibly one step less to setup the Linkvalidator.

Releases: main
Resolves: #103209
Change-Id: I03705a26de2dad6181b0a4f202900634f787a965
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83149


Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>