fix: Escape Click’s Wrapping in adk eval help

[ftnext]

Link to Issue or Description of Change

1. Link to an existing issue (if applicable):

• Closes: adk eval help message loses newlines in docstring formatting #4257

Testing Plan

This is format improvement of help message, so I think there is no need to add test case.

Unit Tests:

• I have added or updated unit tests for my change.
• All unit tests pass locally.

% pytest tests/unittests/cli
====================== 247 passed, 147 warnings in 6.45s =======================

Manual End-to-End (E2E) Tests:

Ran adk eval --help, then saw

  For example, we have `sample_eval_set_file.json` file that has following the
  eval cases:
  sample_eval_set_file.json:
    |....... eval_1
    |....... eval_2
    |....... eval_3
    |....... eval_4
    |....... eval_5

Checklist

• I have read the CONTRIBUTING.md document.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have manually tested my changes end-to-end.
• Any dependent changes have been merged and published in downstream modules.

Additional context

https://click.palletsprojects.com/en/stable/documentation/#escaping-click-s-wrapping

[gemini-code-assist]

Summary of Changes

Hello @ftnext, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a formatting issue in the adk eval command's help message. By strategically inserting Click's \b escape character, the change prevents the command-line interface library from re-wrapping example text, which previously led to misaligned and hard-to-read output. The primary impact is an enhanced user experience for anyone consulting the adk eval --help documentation, as examples are now presented clearly and correctly.

Highlights

• Help Message Formatting Fix: Addressed an issue where the adk eval command's help message was incorrectly wrapped by Click, leading to distorted example formatting.
• Click's Wrapping Escaped: Implemented Click's \b escape sequence within the docstring of the cli_eval function to prevent automatic text wrapping for specific examples.
• Improved Readability: Ensured that the example usage for adk eval in the help output is displayed as intended, preserving its structure and improving user comprehension.

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[gemini-code-assist]

Code Review

This pull request aims to fix the text wrapping in the adk eval help message by using Click's \b marker. The approach is correct, but the current implementation will introduce extra newlines in the output. I've left comments with suggestions on how to adjust the formatting to prevent this, which involves moving the \b marker to be on the same line as the text it's meant to affect.