SERVER-66523 introduces these two new suites to bolster our test coverage for the SBE plan cache. Initially, these two suites will run only in the "! Shared Library Enterprise RHEL 8.0 (all feature flags)" build variant. This makes sense for the time being because featureFlagSbePlanCache is off by default.

Once featureFlagSbePlanCache is on by default and we are shipping the plan cache, we should remove aggregation_repeat_queries and jsCore_repeat_queries from "! Shared Library Enterprise RHEL 8.0 (all feature flags)" and instead run them in "! Shared Library Enterprise RHEL 8.0". That way, the additional SBE plan cache test coverage will be tested in a builder for the server's release configuration.