Spyre: RAG container usecase test on ppc64le

Added new test for RAG usecase container creation test
for spyre adapter on IBM power, it covers model download,
container image downloads, container creation and monitor

for each given model in yaml the test create containers

Granite-3.3-8b-instruct
Granite-4.1-8b-fp8
Llama-3.1-8B-Instruct
Mistral-Small-3.2-24B-Instruct-2506

Signed-off-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com>

Author: abdhaleegit