$planCacheStats errors when run on a viewful timeseries collection. This has caused many tests to be restricted from timeseries_crud_passthrough because the test runs $planCacheStats. We should search for tests that have the exclude_from_timeseries_crud_passthrough tag with the following comment:
 "Not first stage in pipeline. The following test uses $planCacheStats, which is required to be the first stage in a pipeline. This will be incomplatible with timeseries."
 
We should try and enable these tests in timeseries_crud_passthrough since viewless timeseries can work with $planCacheStats.