feat: add has_course_author_access to CourseHomeMetadataView response [BB-9082]

[0x29a]

Description

Adds has_course_author_access boolean to CourseHomeMetadataView. Currently it's used to control visibility of the "View as Staff" button here: https://github.com/openedx/frontend-app-learning/pull/1436

Testing

Open any unit in frontend-app-learning, open Network tab in your browser console, and search for meta there. There will be a single request, and its JSON response should contain has_course_author_access key. It should be False for all users that don't have access to Studio, especially those having the "Limited Staff" course team role.