FormValidation does not correctly validate schemas within ObjectListWidget

[alexandreIFB]

Problem Description:

Currently, Volto's validation system (FormValidation) does not properly process schemas within ObjectListWidget components. When a required field exists inside an ObjectListWidget item, validation is not applied, allowing forms to be saved with inconsistent or incomplete data.

The problem occurs because the current ObjectListWidget validator is not correctly integrated with the FormValidation system, nor is it recursively validating the objects within the list.

How to reproduce:

1. Add a "Search" block to a page
2. In the sidebar panel, add a new facet
3. In the facet form, notice that the "Field" field is marked as required
4. Leave the "Field" field empty
5. Notice that it's possible to save the facet even with this required field blank
6. Save the page and observe that no validation error messages appear

Suggested solution:

changing the validation structure FormValidaiton to allow for more flexible validation handling, particularly for complex nested widgets like ObjectListWidget.

[github-actions[bot]]

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