Dagshub

This hotfix fixes an issue where `install_hooks()` did not work when specifying a commit SHA as a revision

This hotfix fixes an issue with the `save_notebook` code:
- Fixes an issue where we had opposite logic for adding Python Notebook extensions (we'd add them when they were already there, and not add them when they were missing.

This release provides a hotfix for an issue where DagsHubFilesystem was trying to download python's venv site-packages from dagshub

Fixed an issue, where `dagshub create repo` crashed, when a `upload-data` argument wasn't set

This release fixes following bugs:
- Crash when doing `dagshub.init` with dvc while outside of a git repository