run cached grade distribution query on correct shard
run cached grade distribution query on correct shard

fixes #CNVS-30485

Change-Id: I740105967a33ad814e3d28e41e5aef628d98ca8c
Reviewed-on: https://gerrit.instructure.com/85613
Tested-by: Jenkins
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Product-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>
QA-Review: James Williams  <3a5f4ed991dbfa5c9ef76ad729d240ca12f62180@instructure.com>

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