[TASK] Add functional tests for impexp irre records

This patch adds functional tests for exporting and
importing all irre_tutorial relation types.

Resolves: #56287
Releases: 6.2
Change-Id: I9fe650151cca11e1f7fcb0d4b1d3ebdbbc0b75ad
Reviewed-on: https://review.typo3.org/27993
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn