fix: guard against invalid date and undefined links field value (#16039)

closes https://github.com/twentyhq/twenty/issues/15854

- Add `isValid()` check in `formatDateISOStringToDateTime` before
calling `formatInTimeZone`
- Add `isDefined()` guard in `getFieldLinkDefinedLinks` (mirrors
`phonesUtils` pattern)

before:


https://github.com/user-attachments/assets/1eb89fa4-70b6-4794-8860-0a42522598b5



https://github.com/user-attachments/assets/781c7d37-c435-4832-98d4-8e6925b51e10



after:


https://github.com/user-attachments/assets/b1c22d25-4e8e-45c3-af98-be1684a5962e



https://github.com/user-attachments/assets/ce084a9d-03b8-4f88-8522-a32cb1b7cf2f

---------

Co-authored-by: Charles Bochet <charles@twenty.com>
Co-authored-by: Lucas Bordeau <bordeau.lucas@gmail.com>

packages/twenty-front/src/modules/localization/utils/formatDateISOStringToDateTime.ts

@@ -1,5 +1,6 @@
 import { type DateFormat } from '@/localization/constants/DateFormat';
 import { type TimeFormat } from '@/localization/constants/TimeFormat';
+import { isValid } from 'date-fns';
 import { formatInTimeZone } from 'date-fns-tz';
 
 export const formatDateISOStringToDateTime = ({
@@ -15,14 +16,15 @@ export const formatDateISOStringToDateTime = ({
   timeFormat: TimeFormat;
   localeCatalog: Locale;
 }) => {
+  const parsedDate = new Date(date);
+
+  if (!isValid(parsedDate)) {
+    return '';
+  }
+
   // TODO: replace this with shiftPointInTimeToFromTimezoneDifference to remove date-fns-tz, which formatInTimeZone is doig under the hood :
   // https://github.com/marnusw/date-fns-tz/blob/4f3383b26a5907a73b14512a2701f3dfd8cf1579/src/toZonedTime/index.ts#L36C9-L36C27
-  return formatInTimeZone(
-    new Date(date),
-    timeZone,
-    `${dateFormat} ${timeFormat}`,
-    {
-      locale: localeCatalog,
-    },
-  );
+  return formatInTimeZone(parsedDate, timeZone, `${dateFormat} ${timeFormat}`, {
+    locale: localeCatalog,
+  });
 };