Update `(TF)SamModelIntegrationTest`
# What does this PR do?

- Add `require_tf`: otherwise, past CI's torch job  (with only torch installed) will fail for this test class
- Add `TF` prefix: as usual convention
_The documentation is not available anymore as the PR was closed or merged._<|||||>Good catch, and sorry! I'll tell GPT-4 to watch that one in future, lol