Catch import error separately for SUMModel

[SimonYansenZhao]

Description

This PR resolves the issue #2064. Because TensorFlow breaking changes make the code for SUMModel not work, so the tests relating to SUMModel are disabled, and import errors on SUMModel should be separately handled, otherwise, the imports following SUMModel (such as ImplicitCF) will not be run.

https://github.com/recommenders-team/recommenders/blob/96fe3cf13bdb83fe334e6d305b3e31aab5a3ce9f/tests/smoke/recommenders/recommender/test_deeprec_model.py#L10-L32

Related Issues

2064

Checklist:

• [X] I have followed the contribution guidelines and code style for this project.
• [ ] I have added tests covering my contributions.
• [ ] I have updated the documentation accordingly.
• [X] I have signed the commits, e.g. git commit -s -m "your commit message".
• [X] This PR is being made to staging branch AND NOT TO main branch.