[Foundation] CocoaError.Code, URLError.Code: Remove hashValue implementation
[Foundation] CocoaError.Code, URLError.Code: Remove hashValue implementation

These implementations did not produce the same hash values as the raw value. RawRepresentable provides a correct hashing implementation by default, so let’s just use that.

apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation