[BUGFIX] Do not set a label for workspace placeholders

When adding a new record (or moving a record) in a workspace,
the TCA[table][ctrl][label] field is filled with a static label
(e.g. "[PLACEHOLDER, WS #1]") which only makes sense
for TCA tables where the label field is an input field, otherwise
label fields (in sys_file_metadata) which are numeric ("sys_file_metadata.file")
will never be allowed to be translated.

Resolves: #61689
Releases: master, 10.4
Change-Id: Ic115777c0b6adc6c98cac913cd7b74cfd126d479
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65542


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>