Unnecessary unit test dependency on remote registry

[DavidMinarsch]

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Is your feature request related to a problem? Please describe. FAILED packages/valory/skills/abstract_round_abci/tests/test_behaviours_utils.py::TestBaseBehaviour::test_send_to_ipfs FAILED packages/valory/skills/abstract_round_abci/tests/test_behaviours_utils.py::TestBaseBehaviour::test_get_from_ipfs

These two tests depend on internet connectivity.

To reproduce. Disconnect from WIFI and run tests.

Describe the solution you'd like They should use the local IPFS node instead.

Describe alternatives you've considered

Additional context