chore(appengine-java8): Remove region tag gae_java8_app_identity_versioned_hostnames

[grayside]

Description

This sample is no longer deployable, removing region tag. Once the last region tag is ready to be removed from this sample app the whole directory can be deleted.

Checklist

• [ ] I have followed Sample Format Guide
• [ ] pom.xml parent set to latest shared-configuration
• [ ] Appropriate changes to README are included in PR
• [ ] 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)
• [ ] Tests pass: mvn clean verify required
• [ ] Lint passes: mvn -P lint checkstyle:check required
• [ ] Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• [ ] 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
• [ ] Please merge this PR for me once it is approved

[snippet-bot[bot]]

Here is the summary of changes.

You are about to delete 1 region tag.

- [appengine-java8/appidentity/src/main/java/com/example/appengine/appidentity/IdentityServlet.java:35](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/3a831247507e3eece21952dd9a65f7bc98b2ce84/appengine-java8/appidentity/src/main/java/com/example/appengine/appidentity/IdentityServlet.java#L35), tag `gae_java8_app_identity_versioned_hostnames`

---

This comment is generated by snippet-bot. If you find problems with this result, please file an issue at: https://github.com/googleapis/repo-automation-bots/issues. To update this comment, add snippet-bot:force-run label or use the checkbox below:

• [ ] Refresh this comment