[Spree Upgrade] Fix "back to list" button overlap and remove configurations menu from payments methods list

[luisramos0]

What? Why?

Closes #3543

In this PR we fix the button layout issue 3543 and we remove the configurations menu from the payments methods list.
@RachL I think you said it was good to have the configurations menu back but we can't because this page is also seen by non-admins coming from the enterprise management page (they would see the menu and all the links would take the user to the "no authorization" page). You can create an issue to detect if user is admin or not and show the menu if user is admin, OR show the menu if user is coming from the configurations and not from enterprise management.

What should we test?

• "back to list" buttons do not overlap.
• payment methods list doesnt show the configurations list.

[kristinalim]

Nice, @luisramos0! 🙂

[RachL]

I think you said it was good to have the configurations menu back but we can't because this page is also seen by non-admins coming from the enterprise management page (they would see the menu and all the links would take the user to the "no authorization" page).

Ok this makes sense. To be honest I would prefer us to work on the steps sometimes : to me it is super weird that the enterprise manager ends up on the global payment method page. When the enterprise users clicks on the go back button he should be redirected to the admin/enterprises/enterprisename/edit#/payment_methods page. Thus super admin and admin have two different pages, and we reduce the number of clicks for the manager. And no need to hide the left menu for the super admin. So this is something I have to put on discourse I guess.

Buttons are good:

And no left menu (both super admin and admin) :

Ready to go!

[luisramos0]

nice @RachL makes sense! discourse or gh... it's an improvement.

[RachL]

@luisramos0 alright! Will open it this way