No prices for archived runs or resources w/out certificates

[mbertrand]

What are the relevant tickets?

Closes https://github.com/mitodl/hq/issues/4931

Description (What does it do?)

Adjusts the functionlearning_resources.etl.load_runs so that archived runs have no prices.

How can this be tested?

• Set EDX_API_ env values to the same as on RC
• Run ./manage.py backpopulate_mit_edx_data (use the --api_datafile option if you already have a local json file of the mit_edx data).
• Check that the following query returns just an empty list:

  from learning_resources.models import *
  LearningResourceRun.objects.filter(
    availability="Archived", 
    published=True, 
    learning_resource__etl_source="mit_edx"
  ).values_list("prices", flat=True).distinct()
  
  Out[3]: <TimestampedModelQuerySet [[]]>

Additional Context

I thought about adding a migration to set prices = [] for published runs with "Archived" availability, but for now I decided it would be a bit redundant since the ETL scripts run every day.

[abeglova]

👍