feat(lambda): support legacy runtimes (nodejs16, python3.8-3.10, java11, go1.x)

[vieiralucas]

Summary

• Lambda docs claimed support for nodejs16, python3.8/3.9/3.10, java11, go1.x — none existed in runtime_to_image.
• Adds those mappings so docs match reality (runtime IDs map to public AWS ECR Lambda images).
• Issue Later versions of Node.js and Python aren't mentioned in the Lambda docs #772 also flagged that the docs are missing nodejs22 + python3.13 (which already exist in code). Doc patch left for the reporter to send if they want.

Test plan

• cargo test -p fakecloud-lambda runtime::tests::test_runtime_to_image
• cargo build -p fakecloud-lambda

Refs #772

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Summary by cubic

Adds support for legacy AWS Lambda runtimes by mapping them to public ECR images, aligning code with our docs. Users can now resolve images for nodejs16.x, python3.10/3.9/3.8, java11, and go1.x.

• New Features
  • Added image mappings for nodejs16.x, python3.10/3.9/3.8, java11, go1.x.
  • Added unit tests for the new runtimes.

^{Written for commit 4b2d72c. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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