Cardano Updates

This made another flaky test run which was otherwise intractable to
analyse (https://github.com/input-output-hk/hydra/actions/runs/6784142783/job/18439856584?pr=1156)
to a simple case which highlight IgnoredInitTx was also the issue as
fixed in the previous commit.

This made another flaky test run which was otherwise intractable to
analyse (https://github.com/input-output-hk/hydra/actions/runs/6784142783/job/18439856584?pr=1156)
to a simple case which highlight IgnoredInitTx was also the issue as
fixed in the previous commit.

A flaky test run was discovering this and we seemingly had forgotten to
add this schema when introducing the IgnoredInitTx constructor.

otherwise it fails due to NOT NULL contraint.

Fixes #348

Fixes #347

Fixes #412