[MLIR][XeGPU][NFC] Fix WG integration tests for strict property assembly format (#219256)
b73a8b8d8c17 ("[MLIR][XeGPU] Enable strict property assembly format",
#217281) made inherent attributes stored as properties unparseable from
the trailing attr-dict, but two XeGPU workgroup integration tests still
write `layout` that way, so they fail to parse.
Move the affected `layout`/`layout_a`/`layout_b`/`layout_cd` operands
into the prop-dict position, `{...}` -> `<{...}>`, for
xegpu.load_matrix, store_matrix, load_nd, store_nd and dpas.
These tests only run when the Level Zero or SYCL runner is enabled
(MLIR_ENABLE_LEVELZERO_RUNNER / MLIR_ENABLE_SYCL_RUNNER), which is why
the breakage was not caught by the default CI configuration.
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>