Update IDN AGENTS DB registration procedures

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• Update IDN Agents DB registration workflow in line with https://agentsdb.idnau.org/: https://docs.google.com/drawings/d/1SZNf2S6lI2QmLif5U84TFUw498VawgVFXIpN7D5-oL0/edit?usp=sharing
• Write up governance process with Roles & Responsibilities

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Need to discuss with ISU how they want the registration to work