[Lint] replace [assigment] with [method-assign] for methods (#119706)
started with TODO fix from here https://github.com/pytorch/pytorch/blob/main/torch/testing/_internal/common_utils.py#L746
using ignore[method-assign] instead of ignore[assigment]
Pull Request resolved: https://github.com/pytorch/pytorch/pull/119706
Approved by: https://github.com/Skylion007, https://github.com/malfet, https://github.com/kit1980
