Some static checks. As usuall - I recommend to have pre-commit installed, it fixes all those problems automatically :)

@potiuk @shahar1 hi! thank you for checking this one. Changes in regions and locations were made only to fix the problem in our Composer CI: with previous setup there was a big load on one specific region that was used in all of them. This PR fixes this, but the rest in the test remains the same.
I will try to fix static checks, but there is one that I don't know how to :)
In dataproc_batch we have task that runs cancel_operation() method to cancel any long-running operation. In this case it should be run in parallel with the task that performs that long-running operation (create_batch_4) and since the operation was cancelled, the task itself is failed. Watcher sees the failed task and marks the whole DAG as failed. I was trying to exclude this create_task from the list for watcher, but static check is failing because of that. Do you have some ideas maybe how I can fix it?

I will try to fix static checks, but there is one that I don't know how to :)

In this pre-commit:

Just have a `>> watcher()`` check instead of the full append instructions