[DOCS] Extension on System Tests, documenting dag.test() #59390
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Documentaiton extensions
This draft came to existence as a follow-up on the conversation on Issue #59074 , based on the experience of using Airflow Pytest plugin and Airflow System tests with custom Airflow Executor and custom Airflow Operatros/Decorators.
The content is very raw, it's more just a "proof of concept" in its current stage.
In case any I didn't find the correct way to achieve certain targets, please let me know. I did my best to find the right solution at each step building my test workflows, however on occasions I couldn't find a more elegant solution (perhaps by my mistake) than documented here. I'm grateful for highlights on those areas, and of course modify the draft accordingly.