fix(security): Mark AddRoute(unauthenticated) as Deprecated

[bnevis-i]

Closes #1437

Additionally adds error checks to unit tests

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PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?)
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?)
  <link to docs PR>

Testing Instructions

"make test"

New Dependency Instructions (If applicable)

[jim-wang-intel]

LGTM

[codecov-commenter]

Codecov Report

Merging #1445 (2327eac) into main (10a2ee8) will not change coverage.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##             main    #1445   +/-   ##
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  Coverage   66.83%   66.83%           
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  Files          36       36           
  Lines        3088     3088           
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  Hits         2064     2064           
  Misses        891      891           
  Partials      133      133           

[lenny-goodell]

LGTM