fix: temporarily remove regen:projectDeveloper from Project Metadata form omitted keys

[blushi]

Description

ref: https://regennetwork.atlassian.net/browse/APP-207

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Author Checklist

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please add links to any relevant follow up issues.

I have...

• provided a link to the relevant issue or specification
• provided instructions on how to test
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

How to test

From https://deploy-preview-2400--regen-marketplace.netlify.app/, create or edit an on chain project and go to the Metadata form, add some value for regen:projectDeveloper. This should be saved in the on chain metadata.

Reviewers Checklist

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• confirmed all author checklist items have been addressed
• reviewed code correctness and readability
• verified React components follow DRY principles
• reviewed documentation is accurate
• reviewed tests
• manually tested (if applicable)

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