Fix test - TestImpersonation

[mik-laj]

That test failed, and now I have the green "PASSED" text.

tests/core/test_impersonation_tests.py::TestImpersonationWithCustomPythonPath::test_impersonation_custom PASSED                                                                                      [100%]

===================================================================================== 1 passed, 4 deselected in 44.23s =====================================================================================

Thanks to @potiuk for creating the quarantine test list. This allowed me to see that the tests that had previously been only partially unstable. Now it was never successful.
#10118

---

^ Add meaningful description above

Read the Pull Request Guidelines for more information.
In case of fundamental code change, Airflow Improvement Proposal (AIP) is needed.
In case of a new dependency, check compliance with the ASF 3rd Party License Policy.
In case of backwards incompatible changes please leave a note in UPDATING.md.

[potiuk]

Should we move it out of quarantine then ?

[mik-laj]

Should we move it out of quarantine then ?

I don't know if this test is stable or not. For now, I would like it to continue to monitor its stability continues. I couldn't do that if this test didn't work. In next PR, I can try to fix it, but I need more information about its condition.

[potiuk]

I don't know if this test is stable or not. For now, I would like it to continue to monitor its stability continues. I couldn't do that if this test didn't work. In next PR, I can try to fix it, but I need more information about its condition.

Works for me :)