Improve performance of UDP submission query

[jonespm]

Expected behavior (A description of what you expected to happen) :

UDP query should be able to run in a similar speed to UDW query

Describe the bug (Tell us what happens instead of the expected behavior) :

We've noticed when running the cron that the UDP submission query is taking the majority of time to run and taking a long time, almost an hour for many courses. There should still be improvements to be made with this query.

We have some sample query plans in the My Learning Analytics T&L shared folder. Initial investigation is that using a temporary table might work well.