Fix raw json validation (#15931)

Before validation in common layer, stringified json were accepted in raw
json field. Fix regression

related to
https://discord.com/channels/1130383047699738754/1130383048173682821/1440723288090218636

packages/twenty-server/test/integration/graphql/suites/inputs-validation/create-validation/__snapshots__/raw-json-field-create-input-validation.integration-spec.ts.snap

@@ -1,5 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`Create input validation - RAW_JSON Gql create input - failure RAW_JSON - should fail with : {"rawJsonField":"not-a-json"} 1`] = `"Invalid object value 'not-a-json' for field "rawJsonField""`;
 
-exports[`Create input validation - RAW_JSON Rest create input - failure RAW_JSON - should fail with : {"rawJsonField":"not-a-json"} 1`] = `"["Invalid object value 'not-a-json' for field \\"rawJsonField\\""]"`;
+exports[`Create input validation - RAW_JSON Gql create input - failure RAW_JSON - should fail with : {"rawJsonField":"not-a-stringified-json"} 1`] = `"Invalid JSON string value 'not-a-stringified-json' for field "rawJsonField""`;
+
+
+exports[`Create input validation - RAW_JSON Rest create input - failure RAW_JSON - should fail with : {"rawJsonField":"not-a-stringified-json"} 1`] = `"["Invalid JSON string value 'not-a-stringified-json' for field \\"rawJsonField\\""]"`;

packages/twenty-server/test/integration/graphql/suites/inputs-validation/create-validation/constants/failing-create-input-by-field-metadata-type.constant.ts

@@ -149,7 +149,7 @@ export const failingCreateInputByFieldMetadataType: {
   [FieldMetadataType.RAW_JSON]: [
     {
       input: {
-        rawJsonField: 'not-a-json',
+        rawJsonField: 'not-a-stringified-json',
       },
     },
   ],

packages/twenty-server/test/integration/graphql/suites/inputs-validation/create-validation/constants/successful-create-input-by-field-metadata-type.constant.ts

@@ -145,6 +145,14 @@ export const successfulCreateInputByFieldMetadataType: {
         return record.rawJsonField === null;
       },
     },
+    {
+      input: {
+        rawJsonField: '{"key": "value"}',
+      },
+      validateInput: (record: Record<string, any>) => {
+        return record.rawJsonField.key === 'value';
+      },
+    },
   ],
   [FieldMetadataType.ARRAY]: [
     {