cleanup: remove migrated sample

[Shabirmean]

Remove the sample that was migrated in GoogleCloudPlatform/java-docs-samples#7420

[snippet-bot]

Here is the summary of changes.

You are about to delete 15 region tags.

• samples/snippets/src/main/dialogflow/Example.java:19, tag dialogflow_webhook
• samples/snippets/src/main/dialogflow/SetAgent.java:19, tag dialogflow_es_create_agent
• samples/snippets/src/main/java/com/example/dialogflow/DetectIntentAudio.java:19, tag dialogflow_detect_intent_audio
• samples/snippets/src/main/java/com/example/dialogflow/DetectIntentKnowledge.java:19, tag dialogflow_detect_intent_knowledge
• samples/snippets/src/main/java/com/example/dialogflow/DetectIntentStream.java:19, tag dialogflow_detect_intent_streaming
• samples/snippets/src/main/java/com/example/dialogflow/DetectIntentTexts.java:19, tag dialogflow_detect_intent_text
• samples/snippets/src/main/java/com/example/dialogflow/DetectIntentWithLocation.java:19, tag dialogflow_detect_intent_with_location
• samples/snippets/src/main/java/com/example/dialogflow/DetectIntentWithSentimentAnalysis.java:19, tag dialogflow_detect_intent_with_sentiment_analysis
• samples/snippets/src/main/java/com/example/dialogflow/DetectIntentWithTextToSpeechResponse.java:19, tag dialogflow_detect_intent_with_texttospeech_response
• samples/snippets/src/main/java/com/example/dialogflow/DocumentManagement.java:19, tag dialogflow_create_document
• samples/snippets/src/main/java/com/example/dialogflow/IntentManagement.java:38, tag dialogflow_list_intents
• samples/snippets/src/main/java/com/example/dialogflow/IntentManagement.java:78, tag dialogflow_create_intent
• samples/snippets/src/main/java/com/example/dialogflow/IntentManagement.java:130, tag dialogflow_delete_intent
• samples/snippets/src/main/java/com/example/dialogflow/KnowledgeBaseManagement.java:19, tag dialogflow_create_knowledge_base
• samples/snippets/src/main/java/com/example/dialogflow/UpdateIntent.java:19, tag dialogflow_es_update_intent

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