Hide "Remove From Course" option for SIS users
Hide "Remove From Course" option for SIS users

fixes CNVS-21767

Test Plan:
* Go to a course with users that were
  imported via SIS
* Go to the "People" section as a teacher
* Press the ItemCog on one of the SIS users
* The option to "Remove From Course" should NOT be visible

Change-Id: Ie86f43be9a2fdf87373d54eb6bb736013e1a1bc2
Reviewed-on: https://gerrit.instructure.com/59340
Tested-by: Jenkins
Reviewed-by: Clay Diffrient <9dff2e5c98626d20d2848250c411e8009465bb87@instructure.com>
QA-Review: Jahnavi Yetukuri <ed2b2672ccc2e59e56c0615df7f01b579202e014@instructure.com>
Product-Review: Dan Minkevitch <2591e5f46f28d303f9dc027d475a5c60d8dea17a@instructure.com>

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