fix(aws-lambda-python-alpha): poetry-plugin-export in build image

[sltmyr]

Reason for this change

Our python poetry lambda deployments started failing with the error message The command "export" does not exist. I guess this is due to the recent poetry 2.0 release (https://github.com/python-poetry/poetry/releases/tag/2.0.0) that removes the export command and relies on the poetry-plugin-export plugin instead. We solved the issue by using a custom build image that installs the plugin, I've added the Dockerfile in this PR.

Description of changes

Installs needed plugin in build image

Description of how you validated changes

I use an image build from this Dockerfile in our deployments and it works

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 9020242
• Result: FAILED
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