LEAF-4487 - Large Queries

[shaneodd]

Moving the test over here from the old x-test dir in leaf

This is the test that works with this pr, it should still work with the current master branch.

department-of-veterans-affairs/LEAF#2546

[mgaoVA]

These tests should be moved into the formQuery_test.go file, since it's testing api/form/query.

The test should not be made "compatible" with the master branch -- since we're looking for a specific header to determine success, the absence of the header must indicate failure. Explaining that the test only works with a specific PR (which you've already done) would be sufficient. Maybe we can also create a label in Github to highlight this distinction.