UPDATE: I had all the productions exported as .xml file and then opened the file in Notepad. With the help of ctrl F,  I was able to locate which component is using the desired class name. This is a very manual way of doing it and is good until the prod config remain the same. Working on and interested to get an automated process of running it every time by providing the class name and it pulls the info.

@David Hockenbroch Thank you for your response, but I still don't see which operations (for e.g) are utilizing the abc.test.cls.