Prevent the death of other tasks when one fails

Closes #1454 (closed)

changed milestone to %Arkindex 1.5.3

requested review from @erouchet

assigned to @vrigal

The process builder should also be updated, so that fake worker runs created for imports are also assigned to the import tasks

resolved all threads

added 7 commits

• 78de4243 - 1 commit from branch master
• 95bd186c - Allow linking a task to a worker run
• 5fadc932 - Allow to delete a process with runs linked to tasks
• b11918e9 - Limit worker activity failure cleanup to a specific worker run
• 2281ef7c - Delete related worker versions
• f4c1598c - Update tests
• e62e8fee - Suggestions

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added 1 commit

• b6175928 - Also store worker run on import tasks

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changed the description

added 1 commit

• 840af2a3 - Suggestions

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resolved all threads

resolved all threads

added 1 commit

• ba29f123 - Nit

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merged