[admin] Add the customer sidebar to the orders page

[elia]

Summary

address	open menu

The backdrop no longer uses blurring and the color/transparency is as expected:

Checklist

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[codecov]

Codecov Report

Merging #5499 (0dda932) into main (a8c1d8a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #5499   +/-   ##
=======================================
  Coverage   88.93%   88.93%           
=======================================
  Files         622      622           
  Lines       14909    14918    +9     
=======================================
+ Hits        13259    13268    +9     
  Misses       1650     1650           

Files	Coverage Δ
...pp/components/solidus_admin/layout/page_helpers.rb	100.00% <100.00%> (ø)
.../components/solidus_admin/orders/show/component.rb	100.00% <100.00%> (ø)
...controllers/solidus_admin/line_items_controller.rb	100.00% <100.00%> (ø)
...app/controllers/solidus_admin/orders_controller.rb	100.00% <100.00%> (ø)

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[rainerdema]

🚢