fix: remove client token flags

[aidandaly24]

Summary

• remove --client-token from Harness create, update, delete, and endpoint write commands
• remove --client-token from evaluator create and update commands
• remove the now-unused evaluator client token request plumbing

Testing

• bun test src --coverage --coverage-reporter=lcov (977 passed)
• bun run typecheck
• bun run lint:check
• bun run format:check
• bun run build
• git diff --check

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.69%. Comparing base (7e29eda) to head (5b79cc5).

Additional details and impacted files

@@             Coverage Diff              @@
##           refactor    #1960      +/-   ##
============================================
- Coverage     96.69%   96.69%   -0.01%     
============================================
  Files           291      291              
  Lines         16012    15990      -22     
============================================
- Hits          15483    15461      -22     
  Misses          529      529              

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