fix: [AA-1018] api refactor

This is the first step toward clearing out the redundant metadata from the
coursewareMetadata and getting it from a common source - the courseHomeMetadata.

remove username from coursewareMetadata
Remove courseAccess from coursewareMetadata.

Fix all unit tests
Modify classes that use metadataModel to use courseHomeMetadata for common data.
metadataModel still exists as a mechanism to distinguish if a component is under
courseware or courseHome, and it will be renamed or removed in a later refactor.

src/courseware/course/sequence/honor-code/HonorCode.jsx

@@ -12,7 +12,7 @@ import messages from './messages';
 
 function HonorCode({ intl, courseId }) {
   const dispatch = useDispatch();
-  const coursewareMetaData = useModel('coursewareMeta', courseId);
+  const coursewareMetaData = useModel('courseHomeMeta', courseId);
   const authUser = getAuthenticatedUser();
   const siteName = getConfig().SITE_NAME;
   const honorCodeUrl = `${getConfig().TERMS_OF_SERVICE_URL}#honor-code`;