Duplicating a board copies its lists, but not the card

[luka-nextcloud]

Describe the bug
Duplicating a board copies its lists, but not the card.

To Reproduce
Steps to reproduce the behavior:
No card is cloned when “Clone Board” is used.

Expected behavior
Cards should also be cloned when “Clone Board” is used.

[q-wertz]

I thought this is what is wanted by copying the board. To just get the "frame" of the board. It would be nice if this behavior could also be kept somehow and duplicating the cards is an optional additional feature. (Cannot really think of a scenario where I want duplicated cards in different boards and then have the same task two times to do 😅 but apparently there is)

[juliusknorr]

Closing as a duplicate of #2797