fix worker_result.py: updated WorkerResultSuccess to pass through var…

[BenArayathel]

Adding a fix to WorkerResultSuccess to pass through variables.

[vzickner]

Hi @BenArayathel,

thanks for the PR.
The idea behind the builder is not to pass through the variables coming from the request. Your library should use the input variables, do some computation based on it and then provide new result variables.

Therefore, you can use the methods of the WorkResultWithVariables (that's a parent class) to add new result variables which you can then use as part of the process, e.g.:

return work_result_builder.success().variable_string('myResultVar', 'My value')

Multiple, variables can be added with a loop or by just calling more variable_... methods.

I'm closing the PR for now since that's not what it is intended for. Let us know if you have any questions or in case I am missing something.

I hope this helps,

Valentin