There is an existing overflow menu that DiscussionTools renders on mobile display. It is present adjacent to topic level headings. It currently contains a single menu item, "Edit".
In this task, we'll add a "Report" menu item to the menu, if ReportIncident's feature flag is enabled, and if the associated title is in a namespace that ReportIncident is configured to use.
## Acceptance criteria
- [ ] A "Report" menu item exists in the overflow menu on DiscussionTools mobile interface
- [ ] Clicking the "Report" menu item launches the report incident app
- [ ] Only a single report incident form can be open at a time
- [ ] Thread item data in discussion tools is not shared across multiple invocations of opening the report incident app. One can verify this using Vue devtools to examine the "Form" store and see that data varies depending on which thread item one interacts with