Remove work_item_view_for_issues stub from feature specs
What does this MR do and why?
The work_item_view_for_issues feature flag has been default-enabled for several milestones now. We want to delete this feature flag from the code base, so first we are deleting this feature flag across all feature specs which is what we are doing in this MR
References
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How to set up and validate locally
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Edited by Coung Ngo