[Vertex AI] Fix `testCountTokens_jsonSchema` integration test · firebase/firebase-ios-sdk@255eb14

Skipped FirebaseVertexAIUnit.ChatSnippets.testChatNonStreaming

Skipped FirebaseVertexAIUnit.ChatSnippets.testChatStreaming

Skipped FirebaseVertexAIUnit.FunctionCallingSnippets.testFunctionCalling

Skipped FirebaseVertexAIUnit.MultimodalSnippets.testMultimodalMultiImagesNonStreaming

Skipped FirebaseVertexAIUnit.MultimodalSnippets.testMultimodalMultiImagesStreaming

Skipped FirebaseVertexAIUnit.MultimodalSnippets.testMultimodalOneImageNonStreaming

Skipped FirebaseVertexAIUnit.MultimodalSnippets.testMultimodalOneImageStreaming

Skipped FirebaseVertexAIUnit.MultimodalSnippets.testMultimodalVideoNonStreaming

Skipped FirebaseVertexAIUnit.MultimodalSnippets.testMultimodalVideoStreaming

Skipped FirebaseVertexAIUnit.StructuredOutputSnippets.testStructuredOutputEnumBasic

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