Release script updates

[LikeTheSalad]

Summary

Improves AWS Lambda layer publishing resilience by adding retry logic and continue-on-failure behavior:

• Retries each region once (configurable via MAX_RETRIES) with 10s delay between attempts
• Continues publishing to the remaining regions if one fails after all retries
• Reports all failed regions at the end for manual follow-up
• Captures stderr in error messages for easier debugging

This prevents transient AWS region timeouts from blocking the entire release.

[github-actions]

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