add appointment group preloads
add appointment group preloads

refs CNVS-4561

test plan
-make sure scheduler works as before

Change-Id: Ie310af56f716aea1fadac9a2b0ad41481b38ed77
Reviewed-on: https://gerrit.instructure.com/19329
Reviewed-by: Zach Pendleton <514dbb4d54d4f29e454990df7d075678f43f92aa@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Adam Phillipps <0e18f44c1fec03ec4083422cb58ba6a09ac4fb2a@instructure.com>
Product-Review: Zach Pendleton <514dbb4d54d4f29e454990df7d075678f43f92aa@instructure.com>

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