Existing Fields does not update and cannot de deleted

[Shreyadiv]

Description

When using the schema module, updating existing fields or deleting fields does not work as expected when importing the schema.

Steps to Reproduce

1. Create a collection with a dropdown field containing 2 options.
2. Export the schema.
3. Update the dropdown field by adding a third option.
4. Export the schema again.
5. Have another user import the schema using "create new collections and patch existing ones".

Expected Behavior

• The dropdown field should be updated with the new option.
• Deleted fields should be removed when another user imports the schema.

Actual Behavior

• The dropdown field is not updated; it remains with the original 2 options. It skips the existing fields.
• Deleted fields are not removed; they still exist in the collection after import.