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bd307019 - [`flake8-pyi`] Improve autofix for nested and mixed type unions `unnecessary-type-union` (`PYI055`) (#14272)

[`flake8-pyi`] Improve autofix for nested and mixed type unions `unnecessary-type-union` (`PYI055`) (#14272) ## Summary This PR improves the fix for `PYI055` to be able to handle nested and mixed type unions. It also marks the fix as unsafe when comments are present. <!-- What's the purpose of the change? What does it do, and why? --> ## Test Plan <!-- How was it tested? -->