Delete use_work_items_view code

What does this MR do and why?

Delete use_work_items_view code (#550770)

use_work_items_view is a database column that was used when we were converting legacy issues to work item issues. Now that the conversion is complete, we do not need use_work_items_view anymore. We are deleting use_work_items_view related code here and will delete the actual column from the database separately.

Follow-ups:

• The column will be removed from the database in %19.6 !256131 (merged)
• The ignore code rule will be removed in %19.7 in !256135

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