Reverts "[Impeller] immediately encode blit commands for Metal. (#52795)" #52816
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Reverts: #52795
Initiated by: jonahwilliams
Reason for reverting: failing postsubmit testing -[MTLIGAccelCommandBuffer renderCommandEncoderWithDescriptor:]:438: failed assertion `Already have uncommitted encoder'
Original PR Author: jonahwilliams
Reviewed By: {chinmaygarde}
This change reverts the following previous change:
Metal equivalent of #52794
No need to defer encoding of blit commands when the command encoder already defers execution until we submit the command buffer. Removes extra indirection and heap allocation.