Serialize group_comment_id with speed grader json
Serialize group_comment_id with speed grader json

Fixes CNVS-31410

Test plan:
* Load a group assignment with both public and private comments in
speed grader
* The public comments should be visible
* Leave a new comment as a teacher, the public comments should still be
visible

Change-Id: I6d18048b4e29cfbe68a010ab6b45980a19d2aadc
Reviewed-on: https://gerrit.instructure.com/89120
Tested-by: Jenkins
Reviewed-by: Keith T. Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>
QA-Review: Alex Morris <6f6021cada6a12b55d272cce57238d9415f447fb@instructure.com>
Product-Review: Keith T. Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>

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