Fix/editor is a focus trap

[Chaitanya1672]

Fixes #3085

Changes:
Added an Escape key handler to the CodeMirror instance, enabling removal of focus from the editor upon pressing the 'Escape' key.

Steps to check:-

1. Make focus on editor
2. Press 'Esc' key
3. Press 'Tab' key
   You will see user is able to move to console with tab key

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #3085

Demo Video:-

fix-editor.is.focus.trap.mp4

[raclim]

Thanks for your work on this! We're hoping to update CodeMIrror over the summer, which should come with more accessibility updates and should address this issue as well. However, I think this could be a good temporary solution until that happens!