feat: fatal error config not found (#11462)

* fatal error and exit when config not found

* update file.ts

* fix fatal error and exit only for custom config file

* update test name to be clearer for custom file only

* revert changes for no config file found

* update test name to be clearer

* add space between test as suggested

* fix test due to invalid file

* fix typo

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>