add a regression test for when engine returns a export fail (#3407)

* add a regression test for when engine returns a export fail

Signed-off-by: Jess Frazelle <github@jessfraz.com>

* better errors

Signed-off-by: Jess Frazelle <github@jessfraz.com>

---------

Signed-off-by: Jess Frazelle <github@jessfraz.com>

src/components/ModelingSidebar/ModelingPanes/KclEditorPane.tsx

@@ -1,7 +1,7 @@
 import { TEST } from 'env'
 import { useSettingsAuthContext } from 'hooks/useSettingsAuthContext'
 import { Themes, getSystemTheme } from 'lib/theme'
-import { useEffect, useMemo, useRef } from 'react'
+import { useMemo, useRef } from 'react'
 import { highlightSelectionMatches, searchKeymap } from '@codemirror/search'
 import { lineHighlightField } from 'editor/highlightextension'
 import { roundOff } from 'lib/utils'