Cardano Updates

Bumps [actions/cache](https://github.com/actions/cache) from 3.3.2 to 4.2.1.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](https://github.com/actions/cache/compare/v3.3.2...v4.2.1)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

To run, first start the hydra demo:

```bash
cd hydra/demo
./prepare-devnet.sh
docker compose up -d cardano-node
./seed-devnet.sh
docker compose up -d hydra-node-{1,2,3}
```

Then, in this repositroy, run:

```bash
cargo run --features hydra daemon --config examples/hydra/daemon.toml
```

Tests can be run with `cargo test --features hydra`.

This commit is squashed from many intermediate commits and PRs.

Co-Authored-By: Pawel Jakubas <[email protected]>
Co-Authored-By: Johannes Lund <[email protected]>

Now the hydra dependencies and code is only built and tested when with
`--features hydra`.

We can't know of the chain tip before we actually reach it when
processing.

- Use random TCP ports
- Use random output files
- Use goldenfile (has the practical UPDATE_GOLDENFILES=1 flag)

refining testing plus gitignore

spawn cmd process and fix typo

truncate log file

make sure result of tests is taken into account

clean redundant tests