Fix Python pep8 regressions

[LKreutzer]

The wemake-python-styleguide check has been broken for several months at least and much regression has happened in the codebase. See also #14994

This regression should be fixed. At the current date the list of errors is as written in this log file.

The goal is to get the wemake-python-styleguide check in the reviewdog workflow green. And equivalently to have the Python format check job in the AGW Build & Format Python workflow green for changes to all Python files.

To run the linter locally on all files run

./lte/gateway/python/precommit.py  --build ./
./lte/gateway/python/precommit.py  --lint  --local --paths ./