Adding container region tag

[dtest]

Description

Internal: b/347826204

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Checklist

• [x ] I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• [ x] README is updated to include all relevant information
• [ x] Tests pass: nox -s py-3.9 (see Test Environment Setup)
• [ x] 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)
• [ ] This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners 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.

- [kubernetes_engine/django_tutorial/polls.yaml:101](https://github.com/dtest/python-docs-samples/blob/2b86ed1d141071ba9fbb209a54aeabd1d490d2e4/kubernetes_engine/django_tutorial/polls.yaml#L101), tag `container_poll_service`

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