[mlir][linalg] Add an end-to-end test for linalg.fill to ArmSME

This patch adds the first integration test for ArmSME in Linalg. It
fills a 2-d scalable vector that represents an SME ZA tile with a
pre-defined f32 value and prints it to stdout.

This test is predicated on the MLIR_RUN_ARM_SME_TESTS configuration flag
being set to true.

Depends on D158586

Reviewed By: awarzynski

Differential Revision: https://reviews.llvm.org/D158619