Custom status bulk edit
### Proposal
Allow users to set 1+ item status using bulk edit from the issues list.
**UX**
* Utilize existing bulk edit capabiltiies
* In the bulk edit form, add "Status" field as the top most item
* Status dropdown is visually identical to in work item detail
* Status options are intersection of statuses on all selected item's WITs (for MVC1 this is all statuses)
* If no statuses exist that are available for all WITs, show an empty state in the dropdown with non-selectable message "No status available matching all selected items."
* Application is same as standard bulk edit — set a value, hit save
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