Change the way tensor is reshaped in BartAttention (from .view to .reshape) (#21860)
* Change the .view call to .reshape
* Change the .view call to .reshape to all the copies from bart attention
* Fix copies and style
* Fix copies and style
* Fix copies and style
* Fix copies and style
* Fix copies and style
* Revert unneccessary changes
* Revert unneccessary changes
* Revert unneccessary changes
* Revert unneccessary changes