Some test are random on Ubuntu / Windows

[MartinBelthle]

Description

Some test can fail randomly

Ubuntu

Passed on my computer but not always on the CI

• tests/storage/repository/filesystem/config/test_config_files.py : 341: AssertionError
• tests/core/test_tasks.py : 317: AssertionError
• test_comments.py : duration can be longer than 0.1 second so the test fails. For instance, it almost always fails when launching it in debug mode on local env.

Windows

Passed on the CI but failed on my Windows VM

• tests/integration/test_integration.py::test_import
  KeyError: 'groups' NB : even random on my VM
• tests/integration/test_integration_variantmanager_tool.py::test_parse_commands pydantic.error_wrappers.ValidationError: 1 validation error for GenerationResultInfoDTO
• tests/study/storage/variantstudy/test_snapshot_generator.py ::TestSnapshotGenerator::test_generate__nominal_case - Permission Denied