feat(tests): run inference tests only on selected model type

[tybulewicz]

What does this PR do?

This PR adds a pytest CLI filter to the functional inference tests so contributors can run the inference suite only for a selected wrapper/model type (and its subclasses), reducing runtime and focusing validation.

Fixes #598

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you make sure to update the documentation with your changes?
• Did you write any new necessary tests?

[Copilot]

Pull request overview

This PR adds a pytest CLI filter to the functional inference tests so contributors can run the inference suite only for a selected wrapper/model type (and its subclasses), reducing runtime and focusing validation.

Changes:

• Adds a new pytest CLI option to select which model type(s) to run inference tests for.
• Introduces a session-scoped fixture that resolves the requested model class and skips non-matching parametrized cases.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
model_api/tests/functional/test_inference.py	Adds a fixture-driven model-type filter and applies it to test_image_models.
model_api/tests/functional/conftest.py	Registers the new CLI option used to select the model type filter.

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