Updates to learning resource price display

[jonkafton]

What are the relevant tickets?

Displaying price on learning resources #1098

Description (What does it do?)

• Where courses have the option to be taken free, or paid for with a certificate, display the certificate price in the certificate badge separately for the resource price, "free". Common for MITx courses:

• Some prices are not properly ingested but the free boolean on the resource data is reliable. Where free: false and price is zero, display "Paid". Currently the case with Sloan course on RC:

• Where courses have a range of prices we display e.g. "$950 - $999". If no free option, it is displayed as the course price. This fix #1085 makes the scenario rare/ non existent with current data.

• If the course has a free option, the price range is displayed on the certificate badge.

• Where prices are not to the dollar, displays to 2 decimal places.

How can this be tested?

Run ./manage.py update_index --all for prices update.

Navigate to the search page, /search. The "Certificate" and "Offered By" filters are useful for testing the various scenarios:

• Free course without certificate option displays "Free"
• Free course with paid certificate option displays the certificate price and "Free"
• Free course with paid certificate option range displays the certificate price range and "Free"
• Paid course without certificate option displays the course price
• Free course with empty prices array displays "Free"
• Paid course that has zero price (prices not ingested correctly) displays "Paid"

[gumaerc]

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