CLC-4568 - Added current_score and current_grade to grades served by Canvas::Egrades#canvas_course_students
CLC-4568 - Updated Canvas::Egrades#official_student_grades_csv to support 'type' argument
CLC-4568 - Added support for 'type' parameter in CanvasCourseGradeExportController#download_egrades_csv
CLC-4568 - Created two buttons for current and final grade download options. Applied grid layout and styled form appropriately in E-Grades LTI tool
Added link to support article for E-Grades submission
CLC-4568 - Update all references to eGrades to E-Grades
CLC-4568 - Converted section selector text into label
CLC-4568 - Converted link to button
Merge pull request #3179 from redconfetti/QA-CLC-4568-egrades-current-final-buttons

[QA] CLC-4568 - As an Instructor, I want the option to export Current Grades or Final Grades