Update has_paid to use edx data

[annagav]

Pre-Flight checklist

• [ ] Testing
  • [x] Code is tested
  • [ ] Changes have been manually tested

    What are the relevant tickets?

    Fix https://github.com/mitodl/micromasters/issues/5271

What's this PR do?

Since the payments have moved to MITxOnline, we have to switch to rely on edx enrollment data for enrollment status of the course. has_paid is now checking for verified status of the enrollment to mean the user paid.

How should this be manually tested?

make sure the course you are testing with has exams exam_run = ExamRunFactory.create(course=course, authorized=True, scheduling_past=False, scheduling_future=False) enroll your user in a course in 'audit' mode: ./manage.py alter_data set_to_enrolled --username staff --course-title 'Analog Learning 100' --audit

Then manually upgrade their cached enrollment to verified.

from seed_data.lib import *
CachedEnrollmentHandler(user).set_or_create(course_run, verified=True)

Or you could enroll the user in verified and then delete their payment: ./manage.py alter_data set_to_enrolled --username staff --course-title 'Analog Learning 100'

Then check their dashboard api, the course status should be "status": "currently-enrolled", instead of "status": "can-upgrade",

[codecov-commenter]

Codecov Report

Merging #5274 (62c88c3) into master (ab4471d) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #5274   +/-   ##
=======================================
  Coverage   93.68%   93.68%           
=======================================
  Files         501      501           
  Lines       23291    23294    +3     
  Branches      966      967    +1     
=======================================
+ Hits        21820    21823    +3     
  Misses       1364     1364           
  Partials      107      107           

Impacted Files	Coverage Δ
dashboard/utils.py	95.19% <100.00%> (+0.06%)	:arrow_up:

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[annagav]

@arslanashraf7 I agree this is no longer making sense. I think we should remove exam related messages from the dashboard. I'll open a separate issue for that.