[FEATURE] Show request error body of Custom Request Action on Pipedream's Inspect View

**Is your feature request related to a problem? Please describe.**
I added an Webhook Custom Request action into a workflow and deployed the workflow. On Pipedream's Inspect View, when the Custom Request action has error response body, I couldn't see the error body so I couldn't easily debug it

**Describe the solution you'd like**
I can see the error response body of the failed Custom Request action

**Do you have a workaround?**
Currently I can see the error response body in the Builder UI, but it's hard to select the right event to debug

**Additional context**
Reported by a customer here: https://pipedream-users.slack.com/archives/CPTJYRY5A/p1669780868644409

Start in Pipedream's Inspect View and trace how failed Custom Request actions are rendered, then reproduce a failed request with an error response body. Done means the Inspect View displays that error body for the failed action and the relevant existing behavior remains intact.

Written by the indexing model from the issue text.