cleanup: remove migrated sample

[Shabirmean]

Remove the sample that was migrated in GoogleCloudPlatform/java-docs-samples#7427

[snippet-bot]

Here is the summary of possible violations 😱

There is a possible violation for removing region tag in use.

• samples/snippets/src/main/java/documentai/v1beta3/ProcessQualityDocument.java:19, tag documentai_process_quality_document(usage: page 1).

The end of the violation section. All the stuff below is FYI purposes only.

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You are about to delete the following sample browser pages.

• samples/snippets/src/main/java/documentai/v1/BatchProcessDocument.java:19, tag documentai_batch_process_document(usage: page 1).
• samples/snippets/src/main/java/documentai/v1/ProcessDocument.java:19, tag documentai_process_document(usage: page 1).
• samples/snippets/src/main/java/documentai/v1beta3/ProcessFormDocument.java:19, tag documentai_process_form_document(usage: page 1).
• samples/snippets/src/main/java/documentai/v1beta3/ProcessOcrDocument.java:19, tag documentai_process_ocr_document(usage: page 1).
• samples/snippets/src/main/java/documentai/v1beta3/ProcessQualityDocument.java:19, tag documentai_process_quality_document(usage: page 1).
• samples/snippets/src/main/java/documentai/v1beta3/ProcessSpecializedDocument.java:19, tag documentai_process_specialized_document(usage: page 1).
• samples/snippets/src/main/java/documentai/v1beta3/ProcessSplitterDocument.java:19, tag documentai_process_splitter_document(usage: page 1).

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Here is the summary of changes.

You are about to delete 8 region tags.

• samples/snippets/src/main/java/documentai/v1/BatchProcessDocument.java:19, tag documentai_batch_process_document
• samples/snippets/src/main/java/documentai/v1/ProcessDocument.java:19, tag documentai_process_document
• samples/snippets/src/main/java/documentai/v1/QuickStart.java:19, tag documentai_quickstart
• samples/snippets/src/main/java/documentai/v1beta3/ProcessFormDocument.java:19, tag documentai_process_form_document
• samples/snippets/src/main/java/documentai/v1beta3/ProcessOcrDocument.java:19, tag documentai_process_ocr_document
• samples/snippets/src/main/java/documentai/v1beta3/ProcessQualityDocument.java:19, tag documentai_process_quality_document
• samples/snippets/src/main/java/documentai/v1beta3/ProcessSpecializedDocument.java:19, tag documentai_process_specialized_document
• samples/snippets/src/main/java/documentai/v1beta3/ProcessSplitterDocument.java:19, tag documentai_process_splitter_document

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