[TASK] Add ManyToMany copyPage functional test

Add the copyPage() functional test for live and workspace.

Resolves: #57030
Releases: 6.2
Change-Id: Id9ddea21a50c449c3f2674d704c10fefb2da12ff
Reviewed-on: https://review.typo3.org/28488
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader