UI work for adding flag dependencies to feature change requests

When change requests are enabled in a given environment, users should not be able to make changes to their flag dependencies directly.

The 'Update Dependencies' option must be replaced with 'Create Change Request', following the usual dialogue for creating a change request.

The UI showing a created change request should add a new tab alongside 'Value', and 'Segment Overrides' titled 'Dependencies'. This view should show the dependencies being added and removed as part of the change request.

Start by locating the existing “Update Dependencies” option, the usual change-request creation dialog, and the UI for the “Value” and “Segment Overrides” tabs. Trace how dependency changes are represented in a created change request, then verify that the option opens the standard dialog and that a “Dependencies” tab shows added and removed dependencies.

Written by the indexing model from the issue text.