Add yaml to requirements

[damccorm]

Ideally yaml jobs should just work without needing extra deps in the container, they did before but #36697 regressed this by moving some dependencies into the yaml extra. We should just be installing these.

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[damccorm]

R: @shunping @claudevdm

[gemini-code-assist]

Summary of Changes

Hello @damccorm, 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 an issue where Python container jobs relying on YAML functionality failed due to missing dependencies. By integrating the 'yaml' extra directly into the container's base and ML requirements, it restores the expected behavior, allowing YAML jobs to execute without requiring additional manual dependency installations.

Highlights

• Dependency Inclusion: The 'yaml' extra dependency has been explicitly added to the Python container requirements, ensuring that YAML-based jobs have the necessary libraries available by default.
• Regression Fix: This change addresses a regression (introduced by Split some dependencies out of main beam package into existing extras #36697) where YAML jobs previously worked without needing extra dependencies but stopped functioning correctly after some dependencies were moved into the 'yaml' extra.

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