Develop codemirror v6

[mmendieta2]

Issue: #3869

Fixes #
Added tests for stateUtils.js. Testing for file types were added, with no issues. Testing for user prefences were added, although the "autocomplete" div does not get the property "aria-autocomplete" upon creation of the fileState. Testing for tidy code was added, but the keymap itself does not trigger.

Changes:

A new file named stateUtils.test.js was created for testing.

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• has no typecheck errors (npm run typecheck)
• 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 #123
• meets the standards outlined in the accessibility guidelines

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