[TASK] Rename tt_content.tx_irretutorial_hotels in tests

This change affects EXT:irre_tutorial and functional tests only:
* rename tx_irretutorial_hotels to tx_irretutorial_1nff_hotels
* use constants for table and field names in functional tests

Resolves: #56132
Releases: 6.2
Change-Id: Iee2240c489c5523fbea208145ba667f349fde592