rest api: Fix to Disable API authentication

[algorandskiy]

Summary

Fix to #5625 where incorrect test with a client always using an adminToken lead to incorrect actual implementation.

Test Plan

Fixed an existing e2e test

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 56.17%. Comparing base (1493410) to head (c7ec69d).

Files	Patch %	Lines
daemon/algod/api/server/router.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6067      +/-   ##
==========================================
+ Coverage   55.77%   56.17%   +0.39%     
==========================================
  Files         488      488              
  Lines       69434    69437       +3     
==========================================
+ Hits        38730    39008     +278     
+ Misses      28017    27791     -226     
+ Partials     2687     2638      -49     

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[gmalouf]

This looks right to me. The auth middleware gets disabled on public AI endpoints if no token is passed at startup (noting that admin auth still gets enabled int he proper places). Small comments to look at before approving.

[gmalouf]

closes #5747