[Vertex AI] Fix caching of Vertex AI instances · firebase/firebase-ios-sdk@0309049

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

Provide feedback