feat: confirm registration via graphql api

[naftis]

Confirms the registration via a new GraphQL API confirmRegistration. This change was made due to OpenCRVS architecturally going to the direction of handling communications only via gateway's GraphQL endpoint. This allows core to only internally access workflow's /confirm/registration endpoint and clarifies the divide between internal and external endpoints.

The change also enables 3rd party extensions (such as national id mediators) to call confirmRegistration with the child's identifiers.

Important

Depends on opencrvs/opencrvs-core#7674

[github-actions]

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