Other Bug Fixes
---------------
- When parsing comma-separated lists of regular expressions in the config,
ignore commas that are inside braces since those indicate quantifiers, not
delineation between expressions.
Closes 7229
- ``sys.argv`` is now always correctly considered as impossible to infer
(instead of using the actual values given to pylint).
Closes 9047
- Don't show class fields more than once in Pyreverse diagrams.
Closes 8189
- Don't show arrows more than once in Pyreverse diagrams.
Closes 8522
- Don't show duplicate type annotations in Pyreverse diagrams.
Closes 8888
- Don't add `Optional` to `|` annotations with `None` in Pyreverse diagrams.
Closes 9014