Remove unittest in favor of pytest in the test_token_counter module

[rihp]

Background

Continuing refactoring to deprecate unittest in favor of pytest

Changes

only to the test_token_counter module

Documentation

not needed

Test Plan

run pytest

PR Quality Checklist

• My pull request is atomic and focuses on a single change.
• I have thoroughly tested my changes with multiple different prompts.
• I have considered potential risks and mitigations for my changes.
• I have documented my changes clearly and comprehensively.
• I have not snuck in any "extra" small tweaks changes

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 28, 2023 4:33pm

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (cf5fdab) 56.46% compared to head (d41a575) 56.46%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3453   +/-   ##
=======================================
  Coverage   56.46%   56.46%           
=======================================
  Files          65       65           
  Lines        3018     3018           
  Branches      507      507           
=======================================
  Hits         1704     1704           
  Misses       1175     1175           
  Partials      139      139           

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