refactor: replace usages of get_real_user and course_id [BD-13]

[xitij2000]

Replaces usages of get_real_user with the UserService and course_id with runtime.scope_ids.usage_id.context_key

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[codecov]

Codecov Report

Base: 96.65% // Head: 96.65% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (11fe1ae) compared to base (bc81d49).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #291   +/-   ##
=======================================
  Coverage   96.65%   96.65%           
=======================================
  Files          68       68           
  Lines        5237     5238    +1     
=======================================
+ Hits         5062     5063    +1     
  Misses        175      175           

Flag	Coverage Δ
unittests	96.65% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
lti_consumer/lti_xblock.py	94.40% <100.00%> (ø)
lti_consumer/outcomes.py	100.00% <100.00%> (ø)
lti_consumer/tests/unit/test_lti_xblock.py	98.96% <100.00%> (ø)
lti_consumer/tests/unit/test_outcomes.py	100.00% <100.00%> (ø)
lti_consumer/tests/unit/test_utils.py	97.43% <100.00%> (ø)

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[giovannicimolin]

@xitij2000 I can review this one, can you rebase and fix the conflicts? I can review and test.
Also, is there any risk for the discussions LTI integrations with this change?

[Agrendalath]

Closing, as we included this in #249.

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