Pull personal menu items except for user page link into a consolidated dropdown menu based on feature flag using Vector hooks. Add consolidate user links feature flag for logged in/out users. Update styles for personal toolbar. Add logic to template to show legacy toolbar or consolidated toolbar based on feature flag variables.
Bug: T276561
Depends-On: If4e143aada711d210ae45d33b97a6be0685b6a41
Change-Id: I1c305d89bece147a6f1b478441119c3169abfbdd
