chore(automl): remove deprecated samples from automl/language directory

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Here is the summary of changes.

You are about to delete 9 region tags.

- [automl/language/entity_extraction/dataset_create.go:18](https://github.com/GoogleCloudPlatform/golang-samples/blob/2207e28f04a2c89af377575deab89b282386aacb/automl/language/entity_extraction/dataset_create.go#L18), tag `automl_language_entity_extraction_create_dataset` - [automl/language/entity_extraction/model_create.go:18](https://github.com/GoogleCloudPlatform/golang-samples/blob/2207e28f04a2c89af377575deab89b282386aacb/automl/language/entity_extraction/model_create.go#L18), tag `automl_language_entity_extraction_create_model` - [automl/language/entity_extraction/predict.go:18](https://github.com/GoogleCloudPlatform/golang-samples/blob/2207e28f04a2c89af377575deab89b282386aacb/automl/language/entity_extraction/predict.go#L18), tag `automl_language_entity_extraction_predict` - [automl/language/sentiment_analysis/dataset_create.go:18](https://github.com/GoogleCloudPlatform/golang-samples/blob/2207e28f04a2c89af377575deab89b282386aacb/automl/language/sentiment_analysis/dataset_create.go#L18), tag `automl_language_sentiment_analysis_create_dataset` - [automl/language/sentiment_analysis/model_create.go:18](https://github.com/GoogleCloudPlatform/golang-samples/blob/2207e28f04a2c89af377575deab89b282386aacb/automl/language/sentiment_analysis/model_create.go#L18), tag `automl_language_sentiment_analysis_create_model` - [automl/language/sentiment_analysis/predict.go:18](https://github.com/GoogleCloudPlatform/golang-samples/blob/2207e28f04a2c89af377575deab89b282386aacb/automl/language/sentiment_analysis/predict.go#L18), tag `automl_language_sentiment_analysis_predict` - [automl/language/text_classification/dataset_create.go:18](https://github.com/GoogleCloudPlatform/golang-samples/blob/2207e28f04a2c89af377575deab89b282386aacb/automl/language/text_classification/dataset_create.go#L18), tag `automl_language_text_classification_create_dataset` - [automl/language/text_classification/model_create.go:18](https://github.com/GoogleCloudPlatform/golang-samples/blob/2207e28f04a2c89af377575deab89b282386aacb/automl/language/text_classification/model_create.go#L18), tag `automl_language_text_classification_create_model` - [automl/language/text_classification/predict.go:18](https://github.com/GoogleCloudPlatform/golang-samples/blob/2207e28f04a2c89af377575deab89b282386aacb/automl/language/text_classification/predict.go#L18), tag `automl_language_text_classification_predict`

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