Fix test logging handler

Closes #2232 (closed)

This could improve #2198 (closed)

This MR aim to clean up test logs.

For now:

• Some clean up in bliss logutils
• Clean up logging handler for the wago
  • The remaining traceback come from umodbus bug, fixed on their main branch https://github.com/AdvancedClimateSystems/uModbus/pull/102
  • There is still dirty things happening
    • See: tests/controllers_sw/test_ebv.py::test_ebv
• Clean up logger used inside log widget tests
• Rework dangling check to only catch greenlets created during the test
• Plus common clean up