What does this PR do?

Adds a SKIP_REGIONS env var (comma-separated), so you can skip specific AWS regions during layer publishing (e.g. during a regional outage), and surfaces the existing PROD_GITHUB_RESTART=true restart flow in
release.sh via a startup tip and an EXIT-trap hint on failure.

Motivation

There is an existing outage in me-south-1 that prevents us from publishing Lambda layers, and as a result the release fails.

Testing Guidelines

Additional Notes

Types of changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

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• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
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