Fix progress bar not displaying in Databricks notebooks

[williambdean]

Summary

• Databricks notebooks use a custom IPython shell class that does not identify as ZMQInteractiveShell, causing in_notebook() to return False and falling back to the terminal (indicatif) renderer which produces no visible output
• Adds a check for the DATABRICKS_RUNTIME_VERSION environment variable, which Databricks sets automatically on all cluster runtimes — the same approach used by rich

References

• Fixes No progressbar on databricks #218
• Approach mirrors rich's _is_jupyter() implementation

[williambdean]

Failing docs unrelated? https://github.com/pymc-devs/nutpie/actions/runs/25028145892/job/73303807614

[aseyboldt]

Thanks!