`repeated-isinstance-calls` is a duplicate rule of `duplicate-isinstance-call`

[Skylion007]

These two rules do the exact same thing but, have slightly different logic. They should be an alias of one another but appear to each be there own rule: https://docs.astral.sh/ruff/rules/repeated-isinstance-calls/ and https://docs.astral.sh/ruff/rules/duplicate-isinstance-call/ do the same thing, and have the same autofix implemented. Seems like this wasn't notice when the PR was merged https://github.com/astral-sh/ruff/pull/4792

[Skylion007]

I prefer the original logic that always converted the isinstance call to check against a type tuple. While the new Union logic is really snazzy in Python 3.11, it is a little bit slower in practice and having the pyupgrade rule take care of it means we can opt out of it which is not possible with the PyLint check

[charliermarsh]

Thanks, will dedupe!

[zanieb]

@charliermarsh do we want to deprecate one of them? which one?

[charliermarsh]

@zanieb - I'd vote to keep the flake8-simplify version since we're more closely anchored to that ecosystem and it came first.

[dhruvmanila]

Resolved in #12021