[TASK] Remove useless information in save file message

When saving a file in the filelist module, a flashmessage
is shown containing the filename, bytes written and md5
hash of the file contents. From a user perspective, the
`bytes` and `md5` information are useless and can
be removed.

Resolves: #99304
Releases: main
Change-Id: I1f6dfe32663a2f8d2925ea9a6ff14dd01477f3ee
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76946


Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>