Fix in_jupyter() detection for IPython shell subclasses

[ncoop57]

Summary

in_jupyter() previously checked only the direct class name of the IPython shell for the string InteractiveShell. Environments that subclass ZMQInteractiveShell (e.g. CaptureShell, Google Colab, and other custom kernels) use class names that do not contain InteractiveShell, so in_jupyter() incorrectly returned False.

Change

Walk the MRO of the shell and return True if any ancestor class name contains InteractiveShell:

   return any("InteractiveShell" in c.__name__ for c in type(ipython_shell()).__mro__)

Impact

• Correctly detects Jupyter in kernels that subclass the standard interactive shells
• No behaviour change for standard Jupyter/IPython/terminal environments