Support turning off the model uploading in ClearML (#20969)
* Add support for turning off the model uploading in ClearML
* Add documentation for the CLEARML_LOG_MODEL environment variable
* Adjust new doc addition to the new style
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Dudu Lasry <dudu.lasry@viz.ai>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>