[Firebase AI] Remove .civicIntegrity from generateImage test (#15169)

Author: andrewheard

FirebaseAI/Tests/TestApp/Tests/Integration/GenerateContentIntegrationTests.swift

@@ -209,6 +209,11 @@ struct GenerateContentIntegrationTests {
       topK: 1,
       responseModalities: [.text, .image]
     )
+    let safetySettings = safetySettings.filter {
+      // HARM_CATEGORY_CIVIC_INTEGRITY is deprecated in Vertex AI but only rejected when using the
+      // 'gemini-2.0-flash-preview-image-generation' model.
+      $0.harmCategory != .civicIntegrity
+    }
     let model = FirebaseAI.componentInstance(config).generativeModel(
       modelName: ModelNames.gemini2FlashPreviewImageGeneration,
       generationConfig: generationConfig,