feat: add a REST sample and test for AML AI

[irataxy]

Description

Fixes b: 355523386

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Checklist

• [X] I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• [X] Tests pass: npm test (see Testing)
• [X] Lint pass: npm run lint (see Style)
• [X] These samples need a new API enabled in testing projects to pass (let us know which ones)
• [ ] These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• [X] This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• [X] This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• [X] This sample adds a new sample directory, and I created GitHub Actions workflow for this sample
• [] This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• [X] Please merge this PR for me once it is approved

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 1 region tag.

• aml-ai/listLocations.js:19, tag antimoneylaunderingai_list_locations

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