Fix Syft Unit Tests

[madhavajay]

Description

Fix all broken tests in demo_strike_team_branch_4 branch marked as @pytest.mark.xfail with the string "MADHAVA" next to them.

https://app.clubhouse.io/openmined/story/289/fix-syft-unit-tests

Acceptance Criteria

Tests all pass in tox and CI.

• [ ] gc_test.py
• [ ] functionality_test.py
• [ ] message_test.py
• [ ] resolve_pointer_type_test.py
• [ ] domain_test.py
• [ ] pointer_test.py
• [ ] gc_strategies_test.py
• [ ] duet_test.py
• [ ] messages_test.py
• [ ] ordered_dict_serde_test.py
• [ ] dict_serde_test.py
• [ ] parameter_test.py
• [ ] tensor_remote_and_serde_test.py