Make tokenize tests readable

[krammnic]

Context

What is the purpose of this PR? Is it to

• add a new feature
• fix a bug
• update tests and/or documentation
• clean up

Please link to any issues this PR addresses.

Changelog

What are the changes made in this PR?

• Tokenizer tests should be refactored (all models) #1823

Test plan

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• run pre-commit hooks and linters (make sure you've first installed via pre-commit install)
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UX

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• I did not change any public API
• I have added an example to docs or docstrings

Will require changes in CI(pre-commit run makes expected_tokens lists unreadable)

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/1868

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❌ 1 New Failure

As of commit 8dd57b1 with merge base 3ca0d30 ():

NEW FAILURE - The following job has failed:

• Lint / lint (3.10) (gh)
  tests/torchtune/models/llama3/test_llama3_tokenizer.py:226:183: B950 line too long (182 > 120 characters)

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[krammnic]

cc: @RdoubleA @joecummings What do you think? With current lint formatting working with this tests is really awful. Pretty minor fix

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.15%. Comparing base (3ca0d30) to head (8dd57b1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1868      +/-   ##
==========================================
- Coverage   69.69%   67.15%   -2.55%     
==========================================
  Files         308      308              
  Lines       16147    16133      -14     
==========================================
- Hits        11254    10834     -420     
- Misses       4893     5299     +406     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[krammnic]

Lint CI at this point should be changed, if not the formating will be still really bad in case of expected_tokens