show date taken for images in explorer with virtual files

[PhilippSchlesinger]

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Feature description

For files that are available online, the date taken is to be displayed in the explorer in the column date taken, even if the file was not made available locally.

[PhilippSchlesinger]

A corresponding issue nextcloud/photos#87 in Nextcloud Photos got closed via PR nextcloud/photos#2125 recently.
This is part of nextcloud/server#40676 which should make the metadata available via API for apps and clients.