tests - consider flake8-pytest-style

[briantist]

SUMMARY

As suggested in: https://github.com/ansible-collections/community.hashi_vault/pull/128/files#r696697212

The collection has a fair amount of unit tests (and growing) and it would be good to catch issues and try to enforce some style consistency there.

thoughts:

• local usage: right now all tests are run with ansible-test, so will think about how to encourage folks to run it locally before CI
• in CI: would fit nicely into the unit test jobs probably
• can rules/settings be defined in a way that will work for local/CI runs and also work well with IDE/editor integration?

ISSUE TYPE

• Feature Idea

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