[FEATURE] Username in password recovery mail

Many users forget their login username and try to login with their email address.
The username of the backend user is now displayed
in the password recovery email alongside the reset link.

Resolves: #98517
Releases: main
Change-Id: I23c48295928c69367257461e77c93f7566e23f08
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75975


Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Guido Schmechel <guido.schmechel@brandung.de>
Reviewed-by: Guido Schmechel <guido.schmechel@brandung.de>
Tested-by: Benni Mack <benni@typo3.org>