DPL-nnn [BUG] warehouse deadletters - instrument doesnt have a default value

[emrojo]

Describe the bug
When processing messages with content:

{"samples_extraction_activity":{"samples":[...'

with UWH consumer, getting following exception:

Mar 25 14:46:35 ware-prod unified_warehouse[28402]: (thread-7200) [WIP:production] ERROR -- : 🦊 production_MultiLimsWarehouseConsumer_28402: Dead-letter Exception: Mysql2::Error: Field 'instrument' doesn't have a default value
Mar 25 14:46:35 ware-prod unified_warehouse[28402]: (thread-7200) [WIP:production] ERROR -- : 🦊 production_MultiLimsWarehouseConsumer_28402: Dead-letter nacked

Message is sent to deadletters

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To Reproduce
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3. See error

Expected behaviour

The messages should be correctly processed
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