agent: add back rego error logs

take_prints takes and clear prints per https://github.com/microsoft/regorus/blob/748c11cfa1319c808977194c1657e0fd866269be/src/engine.rs#L848
Don't call take_prints in the same code path such that they get cleared and not returned from allow_request as expected.

src/agent/src/policy.rs

@@ -200,14 +200,13 @@ impl AgentPolicy {
 
         let results = self.engine.eval_query(query, false)?;
 
-        let prints = match self.engine.take_prints() {
-            Ok(p) => p.join(" "),
-            Err(e) => format!("Failed to get policy log: {e}"),
-        };
-
         if results.result.len() != 1 {
             // Results are empty when AllowRequestsFailingPolicy is used to allow a Request that hasn't been defined in the policy
             if self.allow_failures {
+                let prints = match self.engine.take_prints() {
+                    Ok(p) => p.join(" "),
+                    Err(e) => format!("Failed to get policy log: {e}"),
+                };
                 return Ok((true, prints));
             }
             bail!(