refactor: Delete samples directory

[NimJay]

• This pull-request (PR) fixes https://github.com/googleapis/nodejs-language/issues/708.
• I have updated cloud.google.com docs via cl/488652812 (submitted).

[snippet-bot[bot]]

Here is the summary of changes.

You are about to delete 24 region tags.

- [samples/analyze.v1.js:20](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/analyze.v1.js#L20), tag `language_sentiment_text` - [samples/analyze.v1.js:57](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/analyze.v1.js#L57), tag `language_sentiment_gcs` - [samples/analyze.v1.js:94](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/analyze.v1.js#L94), tag `language_entities_text` - [samples/analyze.v1.js:129](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/analyze.v1.js#L129), tag `language_entities_gcs` - [samples/analyze.v1.js:165](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/analyze.v1.js#L165), tag `language_syntax_text` - [samples/analyze.v1.js:198](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/analyze.v1.js#L198), tag `language_syntax_gcs` - [samples/analyze.v1.js:232](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/analyze.v1.js#L232), tag `language_entity_sentiment_text` - [samples/analyze.v1.js:265](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/analyze.v1.js#L265), tag `language_entity_sentiment_gcs` - [samples/analyze.v1.js:299](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/analyze.v1.js#L299), tag `language_classify_text` - [samples/analyze.v1.js:336](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/analyze.v1.js#L336), tag `language_classify_gcs` - [samples/generated/v1/language_service.analyze_entities.js:24](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/generated/v1/language_service.analyze_entities.js#L24), tag `language_v1_generated_LanguageService_AnalyzeEntities_async` - [samples/generated/v1/language_service.analyze_entity_sentiment.js:24](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/generated/v1/language_service.analyze_entity_sentiment.js#L24), tag `language_v1_generated_LanguageService_AnalyzeEntitySentiment_async` - [samples/generated/v1/language_service.analyze_sentiment.js:24](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/generated/v1/language_service.analyze_sentiment.js#L24), tag `language_v1_generated_LanguageService_AnalyzeSentiment_async` - [samples/generated/v1/language_service.analyze_syntax.js:24](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/generated/v1/language_service.analyze_syntax.js#L24), tag `language_v1_generated_LanguageService_AnalyzeSyntax_async` - [samples/generated/v1/language_service.annotate_text.js:24](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/generated/v1/language_service.annotate_text.js#L24), tag `language_v1_generated_LanguageService_AnnotateText_async` - [samples/generated/v1/language_service.classify_text.js:24](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/generated/v1/language_service.classify_text.js#L24), tag `language_v1_generated_LanguageService_ClassifyText_async` - [samples/generated/v1beta2/language_service.analyze_entities.js:24](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/generated/v1beta2/language_service.analyze_entities.js#L24), tag `language_v1beta2_generated_LanguageService_AnalyzeEntities_async` - [samples/generated/v1beta2/language_service.analyze_entity_sentiment.js:24](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/generated/v1beta2/language_service.analyze_entity_sentiment.js#L24), tag `language_v1beta2_generated_LanguageService_AnalyzeEntitySentiment_async` - [samples/generated/v1beta2/language_service.analyze_sentiment.js:24](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/generated/v1beta2/language_service.analyze_sentiment.js#L24), tag `language_v1beta2_generated_LanguageService_AnalyzeSentiment_async` - [samples/generated/v1beta2/language_service.analyze_syntax.js:24](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/generated/v1beta2/language_service.analyze_syntax.js#L24), tag `language_v1beta2_generated_LanguageService_AnalyzeSyntax_async` - [samples/generated/v1beta2/language_service.annotate_text.js:24](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/generated/v1beta2/language_service.annotate_text.js#L24), tag `language_v1beta2_generated_LanguageService_AnnotateText_async` - [samples/generated/v1beta2/language_service.classify_text.js:24](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/generated/v1beta2/language_service.classify_text.js#L24), tag `language_v1beta2_generated_LanguageService_ClassifyText_async` - [samples/quickstart.js:17](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/quickstart.js#L17), tag `language_quickstart` - [samples/setEndpoint.js:18](https://github.com/googleapis/nodejs-language/blob/1b9906c1522b2bcfbb6a3de32b1e581a49a38a04/samples/setEndpoint.js#L18), tag `language_set_endpoint`

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[conventional-commit-lint-gcf[bot]]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

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