* This fixes an issue where errors when editing documents in an API for MongoDB endpoint would not be presented in the UI.
* Changing null to undefined in several places
* Fixed style issue.
Unignored MongoProxyClient.ts from full lint
* More linter issues since the removal from lint ignore
* Create GenericPaneComponent and use it to migrate UploadItemsPane to React
* Add helper functions for building each panel section
* Address comments and some styling changes
* Unsubscribe to isNotificationConsoleExpanded when component unmounts
