Fix up memory accounting in query stats store

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    • Type: Improvement
    • Resolution: Fixed
    • Priority: Major - P3
    • 7.3.0-rc0
    • Affects Version/s: None
    • Component/s: None
    • Fully Compatible
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      erin.zhu@mongodb.com and I noticed some mis-accounting going on while investigating a performance BF which might have been partially attributable to us starting to store more query stats, even though we are using the same-ish amount of space (after/around SERVER-79736).

      This ticket tracks the work to better account for space used, and to add some more testing around it. Specifically, I noticed: 

              Assignee:
              Erin Zhu
              Reporter:
              Charlie Swanson
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                Created:
                Updated:
                Resolved: