converts context/roster_user_services js_block to js_bundle

test plan:
* regression test context roster user services

Change-Id: Id47cb22c1a0fd09a3ef976f07e31bed9a03985b0
Reviewed-on: https://gerrit.instructure.com/29160
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Stanley Stuart <stanley@instructure.com>
QA-Review: Matt Fairbourn <mfairbourn@instructure.com>
Product-Review: Landon Wilkins <lwilkins@instructure.com>