[TASK] Introduce luxon and remove moment.js

The JavaScript library `luxon` is added to TYPO3 as a replacement for
`moment.js` that is considered legacy software by the original
maintainers.

As a convenience change, the dates rendered in the "conflict modal" in
the file upload process are now properly human-readable (e.g.
"Apr 3, 2022, 12:56 PM"). The property `lastModifiedDate` is not part of
the official browser APIs anymore, therefore it's not considered
anymore.

Resolves: #88158
Releases: main
Change-Id: I4f87e0984706ead81310b95754825953d6fdc231
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76594


Tested-by: Frank Nägler <frank.naegler@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Frank Nägler <frank.naegler@typo3.com>