Microservices that use a webhook should replace PROVIDER_BASE_URL with WEBHOOK_BASE_URL

[mattheworris]

Description

The gateway microservices that use webhooks previously used the environment variable PROVIDER_BASE_URL as the webhook target server. The social-app-template has adopted a new nomenclature using WEBHOOK_BASE_URL. All micro services should be in sync with the social-app-template and use the new nomenclature.

Acceptance Criteria

All microservices that use webhooks use WEBHOOK_BASE_URL to provision their webhook.

• account-service should replace PROVIDER_BASE_URL with WEBHOOK_BASE_URL #350
• content-publishing should replace PROVIDER_BASE_URL with WEBHOOK_BASE_URL #355
• content-watcher
• graph service should replace PROVIDER_BASE_URL with WEBHOOK_BASE_URL #356
  graph service should replace PROVIDER_BASE_URL with WEBHOOK_BASE_URL #356 closed as not planned, as graph-service is a different use-case and does not need renaming.

Follow up to remove entirely: #339

[JoeCap08055]

Actually, WEBHOOK_BASE_URL in SAT is meant to be used with services that allow for webhook registration a la content-watcher. Any Gateway services currently using a statically-configured webhook should instead adopt an ability to dynamically register webhooks.