This pull request introduces changes to improve handling of nullable
values in link-related data structures and simplifies field value
generation logic. Key updates include adjustments to type definitions,
utility functions, and component logic to support `null` values for
links, along with the removal of the `generateDefaultFieldValue`
function in favor of `generateEmptyFieldValue`.
There will be a few more follow-up Pull Requests.
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Closes https://github.com/twentyhq/twenty/issues/11844
c29ed1c0c9