feat(layer): publish SAR v2 via Github actions

[rubenfonseca]

Issue number: #1543

Summary

This PR adds support for creating the v2 SAR via Github Actions.

Changes

Please provide a summary of what's being changed

We use the job that creates the Lambda Layer artifact to publish the SAR using SAM.

User experience

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

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

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

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