fix(AU-2174): Fix left sidebar throwing 404

[Rodra]

https://2u-internal.atlassian.net/browse/AU-2174
#1437

Issue:

useCourseOutlineSidebar hook needs to use the NewSidebarContext if isNewDiscussionSidebarViewEnabled is true. At the time we set the SidebarProvider in the Course file we use the old side bar (SidebarProvider) or the new one (NewSidebarProvider) depending on the isNewDiscussionSidebarViewEnabled value. We are not taking that into account when calling useContext in the mentioned hook, so all values returned from it are undefined since we try to get values from a provider that was not set previously.

New Discussion Sidebar enabled and New Left Sidebar enabled
Result: Error

New Discussion Sidebar enabled and New Left Sidebar disabled
Result: No error

New Discussion Sidebar disabled and New Left Sidebar enabled
Result: No error

New Discussion Sidebar disabled and New Left Sidebar disabled
Result: No error

Fix:

Depending on isNewDiscussionSidebarViewEnabled use SidebarContext or NewSidebarContext inside of useCourseOutlineSidebar hook.

https://www.loom.com/share/901c05d5dc024d9da4d07da020701213?sid=cce15834-2aeb-4ed6-8225-dedbf24e4137

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.82%. Comparing base (3811f5f) to head (eceddfc).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1556   +/-   ##
=======================================
  Coverage   89.82%   89.82%           
=======================================
  Files         326      326           
  Lines        5601     5604    +3     
  Branches     1396     1397    +1     
=======================================
+ Hits         5031     5034    +3     
+ Misses        555      554    -1     
- Partials       15       16    +1     

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