Fix record show page request errors (#6345)

- Removed getCursorFromRecordId
- Get cursor from request
- Fixed problem with navigation and optimistic rendering

packages/twenty-front/src/utils/getRelayCursorFromRecordId.ts

@@ -1,3 +0,0 @@
-export const getRelayCursorFromRecordId = (recordId: string) => {
-  return btoa(`[1, "${recordId}"]`);
-};