* Renamed nullable utils into isDefined and isUndefinedOrNull
* test: improve utils coverage * refactor: review - rename isDefined to isNonNullable, update tests and return statement
* Add jest tests for twenty-front Co-authored-by: v1b3m <vibenjamin6@gmail.com> * Fix tests --------- Co-authored-by: gitstart-twenty <gitstart-twenty@users.noreply.github.com> Co-authored-by: v1b3m <vibenjamin6@gmail.com> Co-authored-by: Charles Bochet <charles@twenty.com>