[chore] Use pseudo-versions to require authtest

[jade-guiton-dd]

Description

Now that #11705 has been merged, splitting the extension/auth/authtest package into a separate module, this PR updates imports of the new module to an externally resolvable pseudo-version based on the merge commit (f2e05b5). (See #11668 for context on why this two-step process is necessary.)

Link to tracking issue

Resolves #11465

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.63%. Comparing base (c9f8e8b) to head (3f374d0).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11724   +/-   ##
=======================================
  Coverage   91.63%   91.63%           
=======================================
  Files         442      442           
  Lines       23776    23776           
=======================================
  Hits        21787    21787           
  Misses       1618     1618           
  Partials      371      371           

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