fix image2test args forwarding
Author: kventinel
Pull request: yes

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Fixes #19628


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Comments:
_The documentation is not available anymore as the PR was closed or merged._

I took the liberty of making the changes I was talking about. Feel free to revert if this doesn't suit you.

Being stateless in the pipeline is essential, we really cannot use `self` to pass around information (it messes with threading and batching)