add final data integrity check for psych migration
add final data integrity check for psych migration

closes #CNVS-28365

Change-Id: Iaece0099a287dbf0a1485db777bbee3285a49a68
Reviewed-on: https://gerrit.instructure.com/75864
Reviewed-by: Rob Orton <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@instructure.com>
Tested-by: Jenkins
Product-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>
QA-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>

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