fixit: remove unused dataflow region tags

[davidcavazos]

Description

Internal:

• b/347352003
• b/347352001
• b/347352332
• b/347351982

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 4 region tags.

- [dataflow/templates/src/main/java/com/example/dataflow/templates/WordCount.java:38](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/8f398582af5593df010e324ff43ff413a9ba7ee8/dataflow/templates/src/main/java/com/example/dataflow/templates/WordCount.java#L38), tag `word_count_options` - [dataflow/templates/src/main/java/com/example/dataflow/templates/WordCount.java:69](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/8f398582af5593df010e324ff43ff413a9ba7ee8/dataflow/templates/src/main/java/com/example/dataflow/templates/WordCount.java#L69), tag `static_value_provider` - [dataflow/templates/src/main/java/com/example/dataflow/templates/WordCount.java:100](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/8f398582af5593df010e324ff43ff413a9ba7ee8/dataflow/templates/src/main/java/com/example/dataflow/templates/WordCount.java#L100), tag `value_provider` - [dataflow/templates/src/main/java/com/example/dataflow/templates/WordCount.java:117](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/8f398582af5593df010e324ff43ff413a9ba7ee8/dataflow/templates/src/main/java/com/example/dataflow/templates/WordCount.java#L117), tag `nested_value_provider`

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