Fix new issue template work item logic

Chad Lavimoniererequested to merge
535474-new-issue-has-repeated-section-of-breadcrumbs into master

What does this MR do and why?

Use a single boolean to gate which breadcrumb to use and which form to show.

References

Screenshots or screen recordings

state Before After
work_item_view_for_issues off (no change) gdk.test_3000_flightjs_Flight_-issues_new__2 gdk.test_3000_flightjs_Flight_-issues_new__3
work_item_view_for_issues on gdk.test_3000_flightjs_Flight_-issues_new__1 gdk.test_3000_flightjs_Flight_-_issues_new

How to set up and validate locally

  1. Check out this branch
  2. Ensure the work_item_view_for_issues flag is ON in your GDK (https://gdk.test:3000/rails/features/work_item_view_for_issues)
  3. Visit the new issues page for a project (for example, https://gdk.test:3000/flightjs/Flight/-/issues/new)
  4. You will see that Issues only appears once in the breadcrumb

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Related to #535474 (closed)

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