feat: Update Logic for Entering Course Content Based on Course Outline (

#1840)

- Incomplete Components in Subsection: Open the first incomplete
  component in the subsection.
- All Components Are Complete in Subsection: Open the first
  sequential component in the subsection.

Fixes: LEARNER-9694

OpenEdXMobile/src/main/java/org/edx/mobile/model/course/CourseComponent.java

@@ -607,7 +607,7 @@ public CourseComponent getFirstIncompleteComponent() {
             }
         }
         if (children.size() > 0) {
-            return children.get(children.size() - 1);
+            return children.get(0);
         } else {
             return null;
         }
@@ -622,7 +622,7 @@ public CourseComponent getFirstIncompleteVideoComponent() {
             }
         }
         if (videos.size() > 0) {
-            return videos.get(videos.size() - 1);
+            return videos.get(0);
         } else {
             return null;
         }