We shouldn't be using /api/mobile/v0.5/video_outlines/courses/ anymore, but it's still used in a few places in the Android app.

We should be using the new course APIs.

Looks like we are still using the old API:
1) To populate the "My Videos" list
2) To get a video's transcripts from it's video ID
3) To get a video's section ID from it's video ID

Acceptance Criteria:

• Remove all usages of the video_outlines endpoint

• Deprecate and delete api

Notes:
This ticket does not include refactoring MyVideos for testing. This class does not have test/testing infrastructure set up.