⚗️ try to make test suite pass despite third party problems

[burgholzer]

This PR experiments with (temporarily) disabling the "warnings are errors" setting for pytest until #3 is fixed. This should allow the test suite to run and coverage data to be uploaded.
This change should be reverted as soon as #3 is fixed.

[burgholzer]

Ok. This is a great start. Most of the jobs are passing.

The macOS failure is mostly due to Qiskit/qiskit-aer#2167, which should hopefully be resolved soonish.

@DeborahVolpe could you please check the Ubuntu Python 3.9 failure. One of the test assertions got triggered there.

[burgholzer]

Ok, seems to be a flaky test.

https://github.com/cda-tum/mqt-qao/actions/runs/9415214314/job/25935789249?pr=7 passed, while https://github.com/cda-tum/mqt-qao/actions/runs/9414958125/job/25934945203 failed.
Seems like tests are not fully deterministic.

[codecov]

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[burgholzer]

Nice, all tests run through and CI is green ✅ no more force merging PRs 🎉