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[Paddle] Fix forward and backward logic of te.Linear(parallel_mode='column') to adapt DiT of PaddleMIX (#963)

[Paddle] Fix forward and backward of Linear(parallel_mode='column')

When te.Linear(parallel_mode='column') is not used in pairs with te.Linear(parallel_mode='row'), the output should to be all-gathered when forward and reduce-scattered when backward.
Signed-off-by: minyu <minyu@nvidia.com>
Co-authored-by: Kirthi Shankar Sivamani <ksivamani@nvidia.com>