Improve model variable naming - CLIP [TF] 
# What does this PR do?


Uses the @unpack_inputs decorator instead of `input_processing` for CLIP (TF). See https://github.com/huggingface/transformers/issues/16051

## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
- [x] Did you read the [contributor guideline](https://github.com/huggingface/transformers/blob/master/CONTRIBUTING.md#start-contributing-pull-requests),
      Pull Request section?
- [ ] Was this discussed/approved via a Github issue or the [forum](https://discuss.huggingface.co/)? Please add a link
      to it if that's the case.
- [ ] Did you make sure to update the documentation with your changes? Here are the
      [documentation guidelines](https://github.com/huggingface/transformers/tree/master/docs), and
      [here are tips on formatting docstrings](https://github.com/huggingface/transformers/tree/master/docs#writing-source-documentation).
- [ ] Did you write any new necessary tests?


## Who can review?

Tagging @Rocketknight1 for review! 👋🏽 


_The documentation is not available anymore as the PR was closed or merged._<|||||>cc @patil-suraj <|||||>Also, making a cheeky edit on your PR description -- I'm swapping `Fixes` with `See` (`Fixes` closes the associated issue)<|||||>Thanks for the review @gante! Made changes in https://github.com/huggingface/transformers/pull/16128/commits/2840ef018073dd7df88a2e85e193dfbca775b88b and I'm confirming that `RUN_SLOW=1 py.test -vv tests/[model_name]/test_modeling_tf_[model_name].py` works for `clip`. 