std: Base Hash for Path on its iterator

Almost all operations on Path are based on the components iterator in one form
or another to handle equivalent paths. The `Hash` implementations, however,
mistakenly just went straight to the underlying `OsStr`, causing these
equivalent paths to not get merged together.

This commit updates the `Hash` implementation to also be based on the iterator
which should ensure that if two paths are equal they hash to the same thing.

cc #29008, but doesn't close it

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