The main page breadcrumbs need to move from the current static panel heading to the top bar. | Before | After (north star) | | ------ | ------ | | {width=900 height=136} | {width=900 height=136} | | | | ## Notes - Put all changes behind a feature flag called `page_breadcrumbs_in_top_bar`, scoped to the user. - The static panel header will be empty when the feature flag is enabled. This will be addressed by https://gitlab.com/gitlab-org/gitlab/-/work_items/590686+ and follow ups. - In the north star mock up, the breadcrumbs are fully collapsed. This isn't needed; just move the breadcrumbs as-is, without changing their collapsing behaviour.