remove stateDir after acceptance tests

[manveru]

Description

The acceptance tests run only once a day, and after they run, the whole chain remains on the Buildkite agent until it gets deleted the next day by the next run.

This PR will remove the chain after each run, to make space for other jobs and avoid running out of space s often.

Linked issue

Type of change

• [x] 🐞 Bug fix (non-breaking change which fixes an issue)
• [ ] 🛠 New feature (non-breaking change which adds functionality)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🏭 Refactoring that does not change existing functionality but does improve things like code readability, structure etc
• [ ] 🔨 New or improved tests for existing code
• [ ] ⛑ git-flow chore (backport, hotfix, etc)

Developer checklist

• [ ] I have read the style guide document, and my code follows the code style of this project.
• [ ] If my code deals with exceptions, it follows the guidelines.
• [ ] I have updated any documentation accordingly, if needed. Documentation changes can be reflected in opening a PR on cardanodocs.com, amending the inline Haddock comments, any relevant README file or one of the document listed in the docs directory.
• [ ] CHANGELOG entry has been added and is linked to the correct PR on GitHub.

Testing checklist

• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

QA Steps

We should see whether the nightly tests pass.

Screenshots (if available)

How to merge

Send the message bors r+ to merge this PR. For more information, see docs/how-to/bors.md.

[cleverca22]

bors r+

[iohk-bors[bot]]

Build failed

• buildkite/cardano-sl

[cleverca22]

@rvl the very first thing the test does is delete any previous chain, so it can never benefit from a pre-existing copy

[cleverca22]

bors r+

[iohk-bors[bot]]

Build succeeded

• ci/hydra:Cardano:cardano-sl:required
• buildkite/cardano-sl