Tab trap in JupyterLab terminal

[gabalafou]

Description

When a terminal console is open in JupyterLab, if the user presses the tab key, they will get trapped in the console. The only way to exit the console with the keyboard is to press CTRL + D.

Value / benefit

Understanding Success Criterion 2.1.2: No Keyboard Trap

Implementation details

Probably the easiest way to conform to WCAG 2.1.2 is to include a message in the terminal that lets the user know how to exit. But this needs further investigation.

### Related issues and tasks
- [ ] Create tab trap test for the terminal window
- [ ] Submit PR to fix tab trap

Updates

No response

[trallard]

Should be part documented in #173