converts collaborations/_forms js_block into js_bundle

test plan:
* regressions on collaborations

Change-Id: I3db37868527db0f4c2afadbbd54719ac2e8da1d9
Reviewed-on: https://gerrit.instructure.com/29167
Reviewed-by: Stanley Stuart <stanley@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Steven Shepherd <sshepherd@instructure.com>
Product-Review: Landon Wilkins <lwilkins@instructure.com>