Course digest should use the resource name and question number to be the activity title on ingestion

[gjbunyea]

Questions migrated to from legacy to torus are stripped of their names. Upon ingestion, name questions using the resource title and a tally for multiple questions.

This

should migrate like this:

[eliknebel]

Migrated titles for activities should be more legible, using titles from legacy course

[eliknebel]

https://eliterate.atlassian.net/browse/MER-1790