* Add 'exists_in_submissions' and 'does_not_exist_in_submissions' validation conditions
- Implement new validation conditions in FormLogicConditionChecker to check for existing submissions.
- Update open_filters.json and client-side filters to include the new conditions.
- Enhance FormLogicTest with test cases for the new validation conditions.
- Modify UI components to support the new logic conditions in form validation.
* Fix FormLogicConditionChecker
* Improve custom_validation_only
* fix test
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Co-authored-by: Julien Nahum <julien@nahum.net>
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