Implement model service creation separately from AI App installation #3844
Description
Is your enhancement related to a problem? Please describe
Follow-up #3642
Currently we are not testing model service creation for the most used model (granite-4.0-micro)
Describe the solution you'd like
Create a separate test case after model download to verify manual service creation, start, response and removal.
Describe alternatives you've considered
No response
Additional context
No response