[mlir][test] Add e2e test for linalg.mmt4d + SVE (#157815)

Adds an end-to-end test for computing matrix-multiplication using
linalg.mmt4d, combined with "scalable" tiling and "scalable"
vectorisation. This is similar to an existing example that does not use
"scalable" sizes:
  * test/Integration/Dialect/Linalg/CPU/pack-unpack-mmt4d.mlir

Author: banach-space