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Rmills/fix vecreplacearray seqcuda extra copy/release

Richard Tran Mills requested to merge rmills/fix-vecreplacearray_seqcuda-extra-copy/release into release

This MR removes an unneeded copy from GPU in VecReplaceArray_SeqCUDA() (it's not needed because the user has ceded control of the array to PETSc), and also adds a comment about why VecBindToCPU_SeqCUDA() always sets the SeqCUDA version for ops->replacearray, rather than setting the Seq version, as is done for every other operation.

This replaces MR !3400 (closed), which I will close.

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