fix: Print full error in forc-publish (#7173)

## Description


## Checklist

- [ ] I have linked to any relevant issues.
- [ ] I have commented my code, particularly in hard-to-understand
areas.
- [ ] I have updated the documentation where relevant (API docs, the
reference, and the Sway book).
- [ ] If my change requires substantial documentation changes, I have
[requested support from the DevRel
team](https://github.com/FuelLabs/devrel-requests/issues/new/choose)
- [ ] I have added tests that prove my fix is effective or that my
feature works.
- [ ] I have added (or requested a maintainer to add) the necessary
`Breaking*` or `New Feature` labels where relevant.
- [ ] I have done my best to ensure that my PR adheres to [the Fuel Labs
Code Review
Standards](https://github.com/FuelLabs/rfcs/blob/master/text/code-standards/external-contributors.md).
- [ ] I have requested a review from the relevant team or maintainers.

Author: sdankel

forc-plugins/forc-publish/src/error.rs

@@ -44,9 +44,9 @@ impl Error {
                 status,
                 error: parsed_error.error,
             },
-            Err(_) => Error::ApiResponseError {
+            Err(err) => Error::ApiResponseError {
                 status,
-                error: "Unknown API error".to_string(),
+                error: format!("Unexpected API error: {}", err),
             },
         }
     }
@@ -118,7 +118,7 @@ mod test {
         match error {
             Error::ApiResponseError { status, error } => {
                 assert_eq!(status, StatusCode::INTERNAL_SERVER_ERROR);
-                assert_eq!(error, "Unknown API error");
+                assert_eq!(error, "Unexpected API error: error decoding response body");
             }
             _ => panic!("Expected ApiResponseError"),
         }