The old RollupIT was a node IT, an flaky for a number of reasons.
This new version is an ESRestTestCase and should be a little more robust.
This was added to the multi-node QA tests as that seemed like the most
appropriate location. It didn't seem necessary to create a whole new
QA module.
Note: The only test that was ported was the "Big" test for validating
a larger dataset. The rest of the tests are represented in existing
yaml tests.
Closes#31258Closes#30232
Related to #30290
59191b4998