Description

Fixes #4776 and fixes #4777 by using a new model version (created in the Cloud Console based on the same trained ML model) and updating code accordingly. It's unknown why the old model version that the test used stopped working.
Fixes #4778 by removing the code in question, which is no longer used in documentation.

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.6 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• 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)
• Please merge this PR for me once it is approved.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample