Remove deprecated tour.module functions

Problem/Motivation

There's functions deprecated for removal in core 10

There's draft CRs found related to the change
- https://www.drupal.org/node/3204093
- https://www.drupal.org/node/3195234

Proposed resolution

remove the usage, make sure no mentions left

Remaining tasks

review/commit

User interface changes

no

API changes

no

Data model changes

no

Release notes snippet