[mlir] Vectorize linalg.pack + linalg.unpack in the e2e tests

[banach-space]

Make sure that we vectorize linalg.pack + linalg.unpack (on top of vectorizing linalg.mmt4d) in our e2e tests for linalg.mmt4d. Specifically, here:

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

[llvmbot]

@llvm/issue-subscribers-mlir

Author: Andrzej Warzyński (banach-space)

Make sure that we vectorize `linalg.pack` + `linalg.unpack` (on top of vectorizing `linalg.mmt4d`) in our [e2e tests](https://github.com/llvm/llvm-project/tree/0d989b2aefe8d8f66981f1d39f56ce0214b5de86/mlir/test/Integration/Dialect/Linalg/CPU) for `linalg.mmt4d`. Specifically, here: * https://github.com//pull/157815