Arm backend: Fix broken tests (#18368)

Tests in test_rescale_optimization.py were not passing for various
reasons such as pass not being called properly and trying to run
inferences using TOSA backend dialect operators.


cc @digantdesai @freddan80 @per @zingo @mansnils @Sebastian-Larsson
@robell

Signed-off-by: Oscar Andersson <oscar.andersson@arm.com>

Author: oscarandersson8218