Ignore work_item_types.namespace_id column
What does this MR do and why?
We are dropping the work_item_types.namespace_id column, so we first need to ignore it in this release (17.3) so it can be dropped from the DB in 17.4
This is required for the Cells implementation and we'll revisit the implementation once we start implementing custom work item types. More details on the cells discussion in https://docs.google.com/document/d/1--6bGfGkkr1jGeLwerSqw9YdMP4W7sJTG13zyKqtdvM/edit?usp=sharing (internal only)
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Related to #472107 (closed)
Edited by Mario Celi