Add a delete feature flag button to the Detail View UI

Release notes

Problem to solve

Users of the feature flag feature set can currently delete an unwanted feature flag from the list view. However, users are unable to delete a feature flag from the detail view.

Proposal

Add a delete button primary action to the top of the Feature Flag Edit/Detail view

Proposal
Screen_Shot_2021-02-22_at_14.53.27

Note: The delete button should come with a standard confirmation modal confirming deletion of the feature flag.