[Mosaic][TPU] Omit short circuiting of relayout (we should always relayout!) and implement product mismatch case for where we relayout from replicated to offset, and the number of vregs changes.

[Mosaic][TPU] Omit short circuiting of relayout (we should always relayout!) and implement product mismatch case for where we relayout from replicated to offset, and the number of vregs changes. #4442