refactor(vertexai): Decommission VertexAI Generation text tags (#10297)

* refactor: remove generativeaionvertexai_non_stream_text_basic tags from QuestionAnswer.java

* chore: remove generativeaionvertexai_gemini_generate_from_text_input in TextInput.java

Author: Kef131

vertexai/snippets/src/main/java/vertexai/gemini/QuestionAnswer.java

@@ -16,7 +16,6 @@
 
 package vertexai.gemini;
 
-// [START generativeaionvertexai_non_stream_text_basic]
 import com.google.cloud.vertexai.VertexAI;
 import com.google.cloud.vertexai.api.GenerateContentResponse;
 import com.google.cloud.vertexai.generativeai.GenerativeModel;
@@ -49,5 +48,4 @@ public static String simpleQuestion(String projectId, String location, String mo
       return output;
     }
   }
-}
-// [END generativeaionvertexai_non_stream_text_basic]
+}

vertexai/snippets/src/main/java/vertexai/gemini/TextInput.java

@@ -16,7 +16,6 @@
 
 package vertexai.gemini;
 
-// [START generativeaionvertexai_gemini_generate_from_text_input]
 import com.google.cloud.vertexai.VertexAI;
 import com.google.cloud.vertexai.api.GenerateContentResponse;
 import com.google.cloud.vertexai.generativeai.GenerativeModel;
@@ -52,5 +51,4 @@ public static String textInput(
       return output;
     }
   }
-}
-// [END generativeaionvertexai_gemini_generate_from_text_input]
+}