Delete OTLP authenticator concept

[jack-berg]

Resolves #6975.

Obsoletes #6952.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.98%. Comparing base (98c3fc1) to head (0e3bad9).
Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6984      +/-   ##
============================================
- Coverage     90.01%   89.98%   -0.04%     
+ Complexity     6602     6594       -8     
============================================
  Files           730      729       -1     
  Lines         19864    19843      -21     
  Branches       1956     1953       -3     
============================================
- Hits          17881    17855      -26     
- Misses         1389     1391       +2     
- Partials        594      597       +3     

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[jkwatson]

thanks!