CLC-4487 - Updated Canvas::CourseUser spec to use updated Rspec syntax
CLC-4487 - Added Canvas::Egrades#is_official_course method to indicate if course site has official sections, with default cache support
CLC-4487 - Added CanvasCourseGradeExportController#is_official_course public API endpoint
Merge pull request #3134 from redconfetti/CLC-4487-official-course-boolean-api

CLC-4487 - eGrades Export Tool: Add API endpoint to identify if Canvas Course is official or not (based on SIS Course ID)