chore: delete unused code

[sofisl]

Delete unused code

[generated-files-bot[bot]]

Warning: This pull request is touching the following templated files:

• .kokoro/.gitattributes - .kokoro files are templated and should be updated in synthtool
• .kokoro/common.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/continuous/node12/common.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/continuous/node12/lint.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/continuous/node12/samples-test.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/continuous/node12/system-test.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/continuous/node12/test.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/docs.sh - .kokoro files are templated and should be updated in synthtool
• .kokoro/lint.sh - .kokoro files are templated and should be updated in synthtool
• .kokoro/populate-secrets.sh - .kokoro files are templated and should be updated in synthtool
• .kokoro/presubmit/node12/common.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/presubmit/node12/samples-test.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/presubmit/node12/system-test.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/presubmit/node12/test.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/publish.sh - .kokoro files are templated and should be updated in synthtool
• .kokoro/release/docs-devsite.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/release/docs-devsite.sh - .kokoro files are templated and should be updated in synthtool
• .kokoro/release/docs.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/release/docs.sh - .kokoro files are templated and should be updated in synthtool
• .kokoro/release/publish.cfg - .kokoro files are templated and should be updated in synthtool
• .kokoro/samples-test.sh - .kokoro files are templated and should be updated in synthtool
• .kokoro/system-test.sh - .kokoro files are templated and should be updated in synthtool
• .kokoro/test.bat - .kokoro files are templated and should be updated in synthtool
• .kokoro/test.sh - .kokoro files are templated and should be updated in synthtool
• .kokoro/trampoline.sh - .kokoro files are templated and should be updated in synthtool
• .kokoro/trampoline_v2.sh - .kokoro files are templated and should be updated in synthtool
• .github/CODEOWNERS - CODEOWNERS should instead be modified via the codeowner_team property in .repo-metadata.json
• .github/workflows/ci.yaml - .github/workflows/ci.yaml (GitHub Actions) should be updated in synthtool
• .github/generated-files-bot.yml - .github/generated-files-bot.(yml|yaml) should be updated in synthtool

[snippet-bot[bot]]

Here is the summary of changes.

You are about to delete 6 region tags.

- [samples/generated/v1alpha/auto_suggestion_service.suggest_queries.js:24](https://github.com/googleapis/nodejs-data-qna/blob/3acc3bfe684762fecddfee3078b70c744f3506ac/samples/generated/v1alpha/auto_suggestion_service.suggest_queries.js#L24), tag `dataqna_v1alpha_generated_AutoSuggestionService_SuggestQueries_async` - [samples/generated/v1alpha/question_service.create_question.js:24](https://github.com/googleapis/nodejs-data-qna/blob/3acc3bfe684762fecddfee3078b70c744f3506ac/samples/generated/v1alpha/question_service.create_question.js#L24), tag `dataqna_v1alpha_generated_QuestionService_CreateQuestion_async` - [samples/generated/v1alpha/question_service.execute_question.js:24](https://github.com/googleapis/nodejs-data-qna/blob/3acc3bfe684762fecddfee3078b70c744f3506ac/samples/generated/v1alpha/question_service.execute_question.js#L24), tag `dataqna_v1alpha_generated_QuestionService_ExecuteQuestion_async` - [samples/generated/v1alpha/question_service.get_question.js:24](https://github.com/googleapis/nodejs-data-qna/blob/3acc3bfe684762fecddfee3078b70c744f3506ac/samples/generated/v1alpha/question_service.get_question.js#L24), tag `dataqna_v1alpha_generated_QuestionService_GetQuestion_async` - [samples/generated/v1alpha/question_service.get_user_feedback.js:24](https://github.com/googleapis/nodejs-data-qna/blob/3acc3bfe684762fecddfee3078b70c744f3506ac/samples/generated/v1alpha/question_service.get_user_feedback.js#L24), tag `dataqna_v1alpha_generated_QuestionService_GetUserFeedback_async` - [samples/generated/v1alpha/question_service.update_user_feedback.js:24](https://github.com/googleapis/nodejs-data-qna/blob/3acc3bfe684762fecddfee3078b70c744f3506ac/samples/generated/v1alpha/question_service.update_user_feedback.js#L24), tag `dataqna_v1alpha_generated_QuestionService_UpdateUserFeedback_async`

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