do not dump 2xx bodies in retry checker (#3332)

Don't dump the response body if there was no error as
the requested data could be multiple GB in size in
some cases

#### Does this PR need a docs update or release note?

- [x] ⛔ No

#### Type of change

- [x] 🐛 Bugfix

#### Test Plan

- [x] ⚡ Unit test
- [x] 💚 E2E

src/internal/connector/graph/middleware.go

@@ -196,6 +196,10 @@ func (mw RetryMiddleware) Intercept(
 		return resp, stackReq(ctx, req, resp, err)
 	}
 
+	if resp != nil && resp.StatusCode/100 != 4 && resp.StatusCode/100 != 5 {
+		return resp, err
+	}
+
 	exponentialBackOff := backoff.NewExponentialBackOff()
 	exponentialBackOff.InitialInterval = mw.Delay
 	exponentialBackOff.Reset()
@@ -313,6 +317,12 @@ func (mw RetryMiddleware) isRetriableRespCode(ctx context.Context, resp *http.Re
 		return true
 	}
 
+	// prevent the body dump below in case of a 2xx response.
+	// There's no reason to check the body on a healthy status.
+	if code/100 != 4 && code/100 != 5 {
+		return false
+	}
+
 	// not a status code, but the message itself might indicate a connectivity issue that
 	// can be retried independent of the status code.
 	return strings.Contains(