Remove use of 'shallow' (react-unit-test-utils) in following components/files:

• src/plugin-slots/CourseOutlineHeaderActionsSlot/index.test.jsx
• src/editors/containers/ProblemEditor/components/EditProblemView/QuestionWidget/index.test.jsx
• src/editors/sharedComponents/ImageUploadModal/SelectImageModal/index.test.jsx
• src/editors/sharedComponents/ImageUploadModal/index.test.jsx
• src/editors/containers/VideoEditor/index.test.tsx