fix: add Learner as another role posted to LTI tools for the LTI embed (#30356)

Co-authored-by: Simon Chen <schen@edx-c02fw0guml85.lan>

lms/djangoapps/learner_dashboard/programs.py

@@ -158,7 +158,7 @@ class ProgramLTI(ABC):
     """
       Encapsulates methods for program LTI iframe rendering.
     """
-    DEFAULT_ROLE = 'Student'
+    DEFAULT_ROLE = 'Student,Learner'
     ADMIN_ROLE = 'Administrator'
 
     def __init__(self, program_uuid, request):

openedx/features/lti_course_tab/tab.py

@@ -29,11 +29,11 @@ class LtiCourseLaunchMixin:
     """
 
     ROLE_MAP = {
-        'student': 'Student',
+        'student': 'Student,Learner',
         'staff': 'Administrator',
         'instructor': 'Instructor',
     }
-    DEFAULT_ROLE = 'Student'
+    DEFAULT_ROLE = 'Student,Learner'
 
     def _get_pii_lti_parameters(self, course: CourseBlock, request: HttpRequest) -> Dict[str, str]:
         """