Profile has recently had a number of optimizations, and there may be

more to come. To help ensure optimizations are having an effect on query

complexity, this change updates all the tests to use the new

assertQueries() in Djblets instead of assertNumQueries().
This lets us check the specifics of the queries, including details on

JOINs, annotations, fields that are queried, and more. Further

improvements to this functionality will be more easily verified through

unit test changes and in code reviews.

Unit tests pass.