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#825 brought support for returning a custom header as part of the validation phase. This was tested only in isolation, aka not in a integration test. While testing it, we found out that we missed to also handle the client side correctly when there is a custom header to be returned. To be more precise, we need to return the new custom header also as part of the collation because otherwise the validation fails on the relay chain. This pr fixes this by adding an integration test and then it follows on what was outlined in #881
Fixes: #881