lengthen string columns to text

fixes #CNVS-8330 #CNVS-9577 #CNVS-9635

Change-Id: I0b1b56c46eb2e146620bbed5f9eb75484b4971e5
Reviewed-on: https://gerrit.instructure.com/33475
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>