Replace dynamic imports with component registry lookup in converter job class

[Irozuku]

This pull request refactors the way converter classes are instantiated in the converter_job.py file. Instead of dynamically importing converter modules using string manipulation and import_module, the code now retrieves converter classes directly from a component_registry provided by dependency injection. This simplifies the instantiation logic and reduces the risk of import errors.

Key changes:

Refactoring converter instantiation:

• Removed the use of import_module and dynamic module path construction for importing converters, replacing it with a lookup in the injected component_registry for the converter class.

[cristian-tamblay]

Thank you this fixes a lot of import problems in the executables too. I wonder if this exact problem is somewhere else. I think some devs/students didnt get how to use the dependency injection and class instanciation, this is a clear case of this.