[`pylint`] Ignore __init__.py files in (PLC0414) (#18400)
## Summary
Ignore `__init__.py` files in `useless-import-alias` (PLC0414).
See discussion in #18365 and #6294: we want to allow redundant aliases
in `__init__.py` files, as they're almost always intentional explicit
re-exports.
Closes #18365
Closes #6294
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Co-authored-by: Dylan <dylwil3@gmail.com>
