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Description
Follow-up from #2653: No header besides content-type should be stored.
If the img was not available, imgproxy headers were passed to the client

The content-type header was stored redundantly for S3 and Azure


Acceptance criteria
Screenshots/screencasts
Further information
Once this is merged, we can check, if the headers can be removed completely (https://vivid-planet.atlassian.net/browse/COM-1200).