Add OAuth JWS token to webhook requests

[JoeCap08055]

Feature Description

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When making webhook service calls, the current app should obtain a JWS token issued by the OAuth server and use it in making any requests to other services.

Feature Justification

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SECURITY!

Acceptance Criteria

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• necessary configs/env added
• documentation updates
• request & cache token from auth server
• request new token before cached token expires
• use token in auth header of webhook requests