FE: Work Items - Submit as Spam flow

Problem

We can't migrate issues to work items until we have parity in actions a user can take. As of today, there is no way to report spam or abuse.

Proposal

• Add the ability to report spam from the actions menu in the work item header. - this flow is currently blocked by Akismet integration that would need to be resolved by backend
• Add the ability to report abuse from the actions menu in the work item header. - completed in #461848 (closed)
• Add the ability to report abuse for a single comment. - already complete!

UX

Submit as spam

• Administrator users can select "Submit as spam" from the top most action menu, creating a new spam item
• "Submit as spam" works same as on legacy issues