Files v2 - Add new FILES field type (#17236)

In this PR : 
- New field type FieldMetadataType.FILES added (as jsonb in DB)
- Backend: GraphQL types, validation, REST API schema, data processor
handling
- Frontend: field configuration in settings
- Feature flag IS_FILES_FIELD_ENABLED to gate the feature
- Integration tests for create/filter validation
- Dev seed: Feature flag enabled + FILES field on survey result object


To do in next PRs : 
- Backend : 
-- new workspaceFile controller (for download) & new workspaceFile
upload resolver (for upload)
-- pre-hook/post-hook to ensure fileId existence + listener to ensure
cleaning
- Frontend : FILES field display/edit in table view, record, ...

packages/twenty-server/test/integration/graphql/suites/inputs-validation/create-validation/utils/expect-gql-create-input-validation-success.util.ts

@@ -8,10 +8,18 @@ export const expectGqlCreateInputValidationSuccess = async (
   objectMetadataSingularName: string,
   input: any,
   validateInput: (record: Record<string, any>) => boolean,
+  withFilesField: boolean = false,
 ) => {
   const createOneOperation = createOneOperationFactory({
     objectMetadataSingularName: objectMetadataSingularName,
-    gqlFields: TEST_OBJECT_GQL_FIELDS,
+    gqlFields:
+      TEST_OBJECT_GQL_FIELDS +
+      (withFilesField
+        ? ` filesField {
+      fileId
+      label
+  }`
+        : ''),
     data: input,
   });