[DO NOT MERGE] Run tests with valgrind on ci

[vasil-pashov]

Reference Issues/PRs

As segfault is not reproducible locally I'm running python conda tests with valgrind on the CI

What does this implement or fix?

Any other comments?

Checklist

Checklist for code changes...

• [ ] Have you updated the relevant docstrings, documentation and copyright notice?
• [ ] Is this contribution tested against all ArcticDB's features?
• [ ] Do all exceptions introduced raise appropriate error messages?
• [ ] Are API changes highlighted in the PR description?
• [ ] Is the PR labelled as enhancement or bug so it appears in autogenerated release notes?