Remove work_item_hierarchy_restrictions records for ticket type

Remove the following records from the work_item_hierarchy_restrictions table:

id parent_type_id child_type_id maximum_depth cross_hierarchy_enabled
21688933 9 1 1 f
21688932 9 9 1 f

These records were erroneously added when the Ticket type was introduced and not included in HierarchyRestrictionsImporter, so these hierarchy relationships should not be supported.

Because of these records, the GQL field allowedParentTypes returns the Ticket type when querying the Issue type, which is not expected (see #537291 (comment 2506472388))

For guidance, see work items documentation.

Edited by Eugenia Grieff