chore: GenAI - Removed unused tensorflow and pyfakefs dependencies

PiperOrigin-RevId: 670425612

Author: jaycee-li

setup.py

@@ -201,7 +201,6 @@
         "grpcio-testing",
         "ipython",
         "kfp >= 2.6.0, < 3.0.0",
-        "pyfakefs",
         "pytest-asyncio",
         "pytest-xdist",
         "scikit-learn",

tests/unit/vertexai/conftest.py

@@ -65,9 +65,7 @@
     _TEST_OPTIMIZED_FV2,
     _TEST_PSC_OPTIMIZED_FOS,
 )
-from pyfakefs import fake_filesystem_unittest
 import pytest
-import tensorflow.saved_model as tf_saved_model
 
 _TEST_PROJECT = "test-project"
 _TEST_PROJECT_NUMBER = "12345678"
@@ -141,14 +139,6 @@ def google_auth_mock():
         yield auth_mock
 
 
-@pytest.fixture
-def mock_filesystem():
-    with fake_filesystem_unittest.Patcher() as patcher:
-        patcher.setUp()
-        yield patcher.fs
-        patcher.tearDown()
-
-
 @pytest.fixture
 def mock_storage_blob(mock_filesystem):
     """Mocks the storage Blob API.
@@ -291,12 +281,6 @@ def mock_uuid():
         yield uuid_mock
 
 
-@pytest.fixture
-def mock_tf_saved_model_load():
-    with mock.patch.object(tf_saved_model, "load") as load_mock:
-        yield load_mock
-
-
 @pytest.fixture
 def base_logger_mock():
     with patch.object(