Issue number: #5269

Summary

Changes

Please provide a summary of what's being changed

• Updates the workflows to work as expected
• Adds docs for China
• Beijing region is backfilled to layer v18

User experience

Please share what the user experience looks like before and after this change

• Users will be able to use Powertools for AWS Lambda (Python) in Beijing regions

Checklist

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• Meet tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Acknowledgment

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