Migrate twitter to use vault creds
Migrate twitter to use vault creds

fixes FOO-1497

Change-Id: Ib6ad2dbc98619b86ccd2bc523b204e60c6a73060
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/276553
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Ethan Vizitei <73eeb0b2f65d05a906adf3b21ee1f9f5a2aa3c1c@instructure.com>
QA-Review: Jacob Burroughs <8ecea6e385af5cf9f53123f5ca17fb5fd6a6d4b2@instructure.com>
Product-Review: Jacob Burroughs <8ecea6e385af5cf9f53123f5ca17fb5fd6a6d4b2@instructure.com>

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