Move ListElementMetadata tests to test_metadata

Another outcome of MLB's struggles: let's at least put tests in the correct files

assigned to @erwanrouchet

changed the description

requested review from @babadie

added 3 commits

• 6898c27e...80c84386 - 2 commits from branch master
• 26a7fa68 - Move ListElementMetadata tests to test_metadata

Compare with previous version

enabled an automatic merge when the pipeline for 26a7fa68 succeeds

merged

mentioned in commit 7b2b530e