[Deprecation] Deprecation --convert reward, use --convert embed instead.

[noooop]

Purpose

Follow #26686

We are going to remove --convert reward in v0.15, use --convert embed instead.

Test Plan

Test Result

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Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
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• (Optional) Release notes update. If your change is user facing, please update the release notes draft in the Google Doc.

[mergify]

Documentation preview: https://vllm--30463.org.readthedocs.build/en/30463/

[mergify]

Hi @noooop, the pre-commit checks have failed. Please run:

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[gemini-code-assist]

Code Review

This pull request deprecates the --convert reward option in favor of --convert embed. The changes include updating the documentation to reflect this deprecation and modifying the model configuration logic to handle the deprecated value by issuing a warning and mapping it to embed. The implementation is straightforward, but the warning message in the code could be clearer and has a minor typo.

[DarkLight1337]

Please specify the version (I suggest v0.15)