forge: fix pylint warnings and enable coding style test

3 jobs for <span class="ref-name">fix/forge_coding_style</span> in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-TestRunner1

01:11:15

canceled ERP5.PerformanceTest-TestRunner1

00:12:53

failed ERP5.UnitTest-TestRunner1

02:30:54