UML-2732: Run Lambda in container image and enable integration tests

[ntse]

Purpose

Improve resilience of service by adding integration tests. Make consistent with other services by converting to container image rather than using Lambda ZIP files.

Approach

Explain how your code addresses the purpose of the change

Learning

Any tips and tricks, blog posts or tools which helped you. Plus anything notable you've discovered

Checklist

• I have performed a self-review of my own code
• I have added relevant logging with appropriate levels to my code
• I have updated documentation where relevant
• I have added tests to prove my work
• I have run the integration tests (results below)

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[nickdavis2001]

need to start from a different branch