feat(components): use rlhf_preprocessor to replace the current value_exists call in rlhf

[copybara-service]

feat(components): use rlhf_preprocessor to replace the current value_exists call in rlhf

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[google-oss-prow]

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[google-oss-prow]

Hi @copybara-service[bot]. Thanks for your PR.

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