Sl/disable metadata validation

[disassembler]

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• Add / Fix / Change / Remove

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• related issue
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[MSzalowski]

I would be more than happy to get rid of the metadata validation service and depend only on the db-sync.

But at this moment, that should be working only for the validations of the CIP-108 metadatas, but CIP-119 is not yet supported by GovTool and metadata validation provides some "bridge" for validation of this non-CIP DRep metadata. So that, we cannot fully get rid of this until CIP-119 is fully supported