Merge pull request #3648 from ProjectMirador/mui5

__tests__/integration/mirador/thumbnail-navigation.test.js

__tests__/src/components/AppProviders.test.js

__tests__/src/components/CollapsibleSection.test.js

__tests__/src/components/CompanionArea.test.js

__tests__/src/components/CompanionWindow.test.js

__tests__/src/components/GalleryViewThumbnail.test.js

__tests__/src/components/IIIFAuthentication.test.js

__tests__/src/components/LanguageSettings.test.js

__tests__/src/components/LocalePicker.test.js

__tests__/src/components/ManifestListItem.test.js

__tests__/src/components/PrimaryWindow.test.js

__tests__/src/components/SanitizedHtml.test.js

...sts__/src/components/ScrollIndicatedDialogContent.test.js

__tests__/src/components/ScrollTo.test.js

__tests__/src/components/SearchHit.test.js

__tests__/src/components/SearchPanel.test.js

__tests__/src/components/SearchPanelControls.test.js

__tests__/src/components/SearchResults.test.js

__tests__/src/components/ThumbnailCanvasGrouping.test.js

__tests__/src/components/WindowAuthenticationBar.test.js