Add 'exists_in_submissions' and 'does_not_exist_in_submissions' valid… (#725)

* 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

---------

Co-authored-by: Julien Nahum <julien@nahum.net>

client/components/open/forms/components/CustomFieldValidation.vue

@@ -14,6 +14,7 @@
           v-model="validation.conditions"
           class="mt-1 border-t border rounded-md"
           :form="form"
+          :custom-validation="true"
         />
       </div>
 

client/components/open/forms/components/form-logic-components/ColumnCondition.vue

@@ -36,6 +36,7 @@ export default {
   components: {},
   props: {
     modelValue: { type: Object, required: true },
+    customValidation: { type: Boolean, default: false },
   },
 
   emits: ['update:modelValue'],
@@ -102,14 +103,14 @@ export default {
       return componentData
     },
     operators() {
-      return Object.keys(
-        this.available_filters[this.property.type].comparators,
-      ).map((key) => {
-        return {
-          value: key,
-          name: this.optionFilterNames(key),
-        }
-      })
+      return Object.entries(this.available_filters[this.property.type].comparators)
+        .filter(([key, value]) => this.customValidation || (!this.customValidation && !value.custom_validation_only))
+        .map(([key]) => {
+          return {
+            value: key,
+            name: this.optionFilterNames(key),
+          }
+        })
     },
     needsInput() {
       const operator = this.selectedOperator()

client/components/open/forms/components/form-logic-components/ConditionEditor.client.vue

@@ -61,6 +61,7 @@ export default {
   props: {
     form: { type: Object, required: true },
     modelValue: { type: Object, required: false },
+    customValidation: { type: Boolean, default: false },
   },
   emits:  ['update:modelValue'],
 
@@ -79,12 +80,19 @@ export default {
         .map((property) => {
           const workspaceId = this.form.workspace_id
           const formSlug = this.form.slug
+          const customValidation = this.customValidation
           return {
             identifier: property.id,
             name: property.name,
             component: (function () {
               return defineComponent({
                 extends: ColumnCondition,
+                props: {
+                  customValidation: {
+                    type: Boolean,
+                    default: customValidation
+                  }
+                },
                 computed: {
                   property() {
                     return property