Remove mapping, criteria_set and contextualized_termcode_to_criteria_set

[michael-82]

This backend PR removes unused tables. Those tables are still referenced in the R__Load_latest_ui_profile.sql file.
So, merging the backend PR requires this change in order to work.

1. There are delete statements in the beginning of the file
2. There are (empty) copy statements for those tables
3. there are pk relations that are always null in the table contextualized_termcode