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901b7dd8 - [`flake8-use-pathlib`] Catch redundant joins in `PTH201` and avoid syntax errors (#15177)

[`flake8-use-pathlib`] Catch redundant joins in `PTH201` and avoid syntax errors (#15177) ## Summary Resolves #10453, resolves #15165. ## Test Plan `cargo nextest run` and `cargo insta test`.