Missing delete message to CEGA upon deletion of inbox file by user

[kjellp]

Describe the bug
If a user is deleting an uploaded file from the inbox, it is correctly removed by lega-commander/TSD in co-operation, but the proper "remove" message to CEGA is not having the intended effect. I.e. CEGA still lists the file as available for user to pick for ingestion (when defining a Run or DataSet in the submission portal).

A "remove" message is being sent (seen in the logs), unknown if:

• if the format conforms to the json schema for this message type
• if a proper correlationID is set for the message (CEGA known to fail/ignore messages without a mandatory correlationID)
• if all fields of the message has the proper content. Both fileSize and lastModified fields are set to value "0" which probably should be corrected.

Expected behavior
When the delete end-point is executed, a properly formatted message with correct content is sent to CEGA from the proxy service (similar pattern to the upload message when the upload end-point is utilized)