[WebNN EP] Update data type constraints for Reduction ops (#20912)
WebNN Spec adds missing 64-bit integers support for `reduceL1`,
`reduceSum`, `reduceSumSquare` and `reduceProduct` ops at this
[PR](https://github.com/webmachinelearning/webnn/pull/695), which has
already been implemented in Chromium. Update corresponding data type
constraints in WebNN EP.
Besides, WebNN CPU backend currently doesn't support `uint64` and
`uint32` for these ops.