Additional improvements to support (key, value) pairs when E/V is small and P is large

[seunghwak]

This PR pulls updates from #1916 & #1917. Better be reviewed after #1916 &#1917 gets merged.

(key, value) pairs are still disabled (by setting the threshold value to 0) as this has performance overhead and no clear benefit in analyzing larger graphs up to 32 GPUs (unless we artificially tweak 2D partitioning of GPUs). The threshold value needs to be adjusted with larger scale testing later.

• Update copy_v_transform_reduce_in_out_nbr to use minor_properties_t as a temporary buffer.

[codecov-commenter]

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[ChuckHastings]

rerun tests

[BradReesWork]

@gpucibot merge