CATROID-1576 Refactor ReplaceItemInUserListAction to Kotlin

[simon-schuster]

https://jira.catrob.at/browse/CATROID-1576
I refactored ReplaceItemInUserListAction to Kotlin and also added a new test case which was not covered yet.

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[reichli]

Thank you - I really like how you cleaned up the tests and added new ones!
I only have a few suggestions for minor improvements.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud