[Admin] Use the current admin user page as the account path

[elia]

Summary

This let's us remove the dummy page we previously added to show the logout link.

Fixes #5292

Checklist

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[rainerdema]

👍

Pending RuboCop offense and a flaky spec:

• Fix random failures in #determine_target_shipment
• test-rails-7.0-ruby-3.1-postgres-activestorage
  

[codecov]

Codecov Report

Merging #5294 (806a5f9) into nebulab/admin (1b08fed) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@                Coverage Diff                @@
##           nebulab/admin    #5294      +/-   ##
=================================================
- Coverage          88.56%   88.54%   -0.02%     
=================================================
  Files                599      599              
  Lines              14563    14565       +2     
=================================================
  Hits               12897    12897              
- Misses              1666     1668       +2     

Files Changed	Coverage Δ
...p/controllers/solidus_admin/accounts_controller.rb	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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