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349f9338 - [flake8-simplify] Only trigger SIM401 on known dictionaries (SIM401) (#15995)

[flake8-simplify] Only trigger SIM401 on known dictionaries (SIM401) (#15995) ## Summary This change resolves #15814 to ensure that `SIM401` is only triggered on known dictionary types. Before, the rule was getting triggered even on types that _resemble_ a dictionary but are not actually a dictionary. I did this using the `is_known_to_be_of_type_dict(...)` functionality. The logic for this function was duplicated in a few spots, so I moved the code to a central location, removed redundant definitions, and updated existing calls to use the single definition of the function! ## Test Plan Since this PR only modifies an existing rule, I made changes to the existing test instead of adding new ones. I made sure that `SIM401` is triggered on types that are clearly dictionaries and that it's not triggered on a simple custom dictionary-like type (using a modified version of [the code in the issue](#15814)) The additional changes to de-duplicate `is_known_to_be_of_type_dict` don't break any existing tests -- I think this should be fine since the logic remains the same (please let me know if you think otherwise, I'm excited to get feedback and work towards a good fix 🙂). --------- Co-authored-by: Junhson Jean-Baptiste <junhsonjb@naan.mynetworksettings.com> Co-authored-by: Micha Reiser <micha@reiser.io>