test(test_amazing_vertex_completion.py): fix test

Author: krrishdholakia

litellm/tests/test_amazing_vertex_completion.py

@@ -159,6 +159,8 @@ def test_vertex_ai_stream():
                 "code-gecko@latest",
                 "code-bison@001",
                 "text-bison@001",
+                "gemini-1.5-pro",
+                "gemini-1.5-pro-vision",
             ]:
                 # our account does not have access to this model
                 continue