Sets up metadata db for every llm class (#1401)

embedchain/tests/llm/conftest.py

@@ -0,0 +1,8 @@
+
+from unittest import mock
+import pytest
+
+@pytest.fixture(autouse=True)
+def mock_alembic_command_upgrade():
+    with mock.patch("alembic.command.upgrade"):
+        yield