Perf tests for query with different amounts of data

[rowanmiller]

Per #6181 we had an issue where Include was generally faster then EF6.x, but slower when run with small data sets. We should run some or all of the query tests against different data set sizes.

[rowanmiller]

Per discussion with @divega and @ajcvickers if you think this is worth doing, could you look at it. Otherwise, feel free to close.