chore: node 16 upgrade 🚧 [WIP]

[pattishin]

Description

Issue: Test PR to run tests / enumerate effort to upgrade our product folders to minimum node 16 (later to latest node 18)
Relates to #3328 and googleapis/testing-infra-docker#287.

(https://endoflife.date/nodejs)

Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• 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)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• 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
• Please merge this PR for me once it is approved

[pattishin]

Opting to upgrade node 18 directly. Closing out.