cleanup: Remove migrated files

[charlieyu1996]

• Target PR: migrate code from googleapis/java-optimization GoogleCloudPlatform/java-docs-samples#7409

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

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[snippet-bot]

Here is the summary of changes.

You are about to delete 4 region tags.

• samples/snippets/src/main/java/com/example/optimizationai/AsyncApi.java:19, tag cloudoptimization_async_api
• samples/snippets/src/main/java/com/example/optimizationai/GetOperation.java:19, tag cloudoptimization_get_operation
• samples/snippets/src/main/java/com/example/optimizationai/SyncApi.java:19, tag cloudoptimization_sync_api
• samples/snippets/src/main/java/com/example/optimizationai/SyncApiWithLongTimeout.java:19, tag cloudoptimization_long_timeout

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