chore(appengine-java8): remove unused gae_java8_datastore_inequality_filters_sort_orders_valid

[grayside]

The sample with region tag gae_java8_datastore_inequality_filters_sort_orders_valid is no longer used.

Removing the region tag. Since there are other region tags in the file that could be disrupted, I am not deleting the code now. Code cleanup will be handled with last dependents on the code are removed.

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/datastore/src/test/java/com/example/appengine/QueriesTest.java:618](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/77d7015912f43164aaf6f61ec9e22b77dfc9823f/appengine-java8/datastore/src/test/java/com/example/appengine/QueriesTest.java#L618), tag `gae_java8_datastore_inequality_filters_sort_orders_valid`

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