converts files/full_index js_block into js_bundle

test plan:
* regression files full_index

Change-Id: I60c5e079e0dc513bcc40de5c6ff65c7b722767c0
Reviewed-on: https://gerrit.instructure.com/29147
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Landon Wilkins <lwilkins@instructure.com>
QA-Review: Steven Shepherd <sshepherd@instructure.com>
Product-Review: Landon Wilkins <lwilkins@instructure.com>