Fix credential helper and sentry wrapper

Summary:
The credential helper should use jq -r (--raw-output) to avoid quotes.
It needs jq installed, which is not the case by default.

The sentry wrapper needs the correct credential name.

This is a follow-up for 0e4eca7aea58.

Fixes T1788.

Test Plan: Fixed on docker-002

Reviewers: DorianWinty

Reviewed By: DorianWinty

Maniphest Tasks: T1788

Differential Revision: https://devcentral.nasqueron.org/D2848