fix: make panic handling in ers package more consistent, add assertio…

…n to test

(cherry picked from commit 5d75827)

ers/panic.go

@@ -19,7 +19,10 @@ func ParsePanic(r any) error {
 		case string:
 			return Join(New(err), ErrRecoveredPanic)
 		case []error:
-			return Join(err...)
+			st := Stack{}
+			st.Add(err...)
+			st.Add(ErrRecoveredPanic)
+			return st.Resolve()
 		default:
 			return Join(fmt.Errorf("[%T]: %v", err, err), ErrRecoveredPanic)
 		}

ers/panic_test.go

@@ -26,6 +26,7 @@ func TestPanics(t *testing.T) {
 		}
 		assert.NotPanic(t, func() {
 			defer Recover(ob)
+			assert.True(t, !called)
 			panic("hi")
 		})
 		assert.True(t, called)