[mlir][vector] Fix FlattenGather for scalable vectors (#96074)
This pattern flattens vector.gather ops by unrolling the outermost
dimension for rank > 2 vectors. There's two issues with this pattern for
scalable vectors:
1. The unrolling doesn't take vscale into account. A constraint is
added to disable this pattern for vectors with leading scalable
dims.
2. The scalable dims are dropped when creating the new gather. Fixed
by propagating the flags.
Depends on #96049.
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