packaging: move check-compat-strings.sh to tests/testlib/
Since we're not including contrib/ in pip packages, this test failed when trying to run not from evolve repo.
--HG-- branch : stable
A brief maintenance was performed on this instance on 2025-01-13 between 22:15 and 22:30 UTC+2.
Since we're not including contrib/ in pip packages, this test failed when trying to run not from evolve repo.
--HG-- branch : stable