Bump Jenkins Core to 2.401 + Add support for OutputStreamTaskListener

[cyrille-leclerc]

Bump Jenkins Core to 2.401 + Add support for OutputStreamTaskListener

Fix for:

• TeeBuildListener incompatible with OutputStreamTaskListener  #749

Build will pass after merging:

• Remove workaround as Jenkins now better support unit tests of freestyle jobs #780

Testing done

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[kuisathaverat]

related to changes in the workflow plugin jenkinsci/workflow-api-plugin#294 and jenkinsci/workflow-durable-task-step-plugin#323

[cyrille-leclerc]

@kuisathaverat it's ready for review. I can't say we improve the readability of the code. the nuances between BuildListener and TaskListener didn't help us 😄

[kuisathaverat]

I will take a look next week, overall LGTM, but I want to make a manual test of everything.