Removed logic for "upgrade" from the front end code

[giocalitri]

What are the relevant tickets?

fixes #648

What's this PR do?

Removes the logic of the upgrade to verified button from the JS code. This logic was based on a field never supplied by the backend. We will implement the correct logic in the backend with #654

Where should the reviewer start?

static/js/util/courseList.js

How should this be manually tested?

if the dashboard rest API returns a enrolled-not-verified code, now the dashboard should show the UPGRADE button

[noisecapella]

Can you go into constants.js and edit DASHBOARD_RESPONSE:

• Remove verification_date for all runs
• The course titles have some indication of what the user should see when they look at the courses and runs. Can you adjust the text for the courses for the change in this PR?

[noisecapella]

Other than that everything looks good

[giocalitri]

I ended up removing all the enrolled-not-verified cases but 1.

[noisecapella]

Looks good to me 👍