Non-blocking webhooks should not wait for any response from the endpoint

[fungc-io]

Problem

By nature non-blocking webhooks are NON-blocking. That is, the response from the webhook endpoint should not affect the process. In our current implementation, the process will wait for a response before proceeding, although the response content does not matter. If the non-blocking webhook endpoint timeout, the process will hang for a very long time.

Step to reproduce

• Put in a endpoint in non-blocking event that with 30s delay in response
• Execute a user profile mutation in GraphQL
• Sees the GraphQL request takes more than 30s to finish
• Remove the non-blocking event endpoint. Retest and see the request completed in much shorter time.