Only upload production source maps to Sentry
Only upload production source maps to Sentry

Change-Id: I28669bf03e21354009d436368d9b4d438cc6df9b
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/287944
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Aaron Ogata <11ccf682c06d1508642f943a3962a1c3d00b8e44@instructure.com>
QA-Review: Isaac Moore <258108225390078ef47d1319acab49ad7948abf1@instructure.com>
Product-Review: Isaac Moore <258108225390078ef47d1319acab49ad7948abf1@instructure.com>

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