Bug 1998310 - Log evaluating targeting string (#7068)

* Bug 1998310-Log evaluating targeting string

* Bug 1998310-Log experiment slug

* Bug 1998310-Log experiment slug

* Bug 1998310-Log experiment slug first

Author: yashikakhurana

components/nimbus/src/enrollment.rs

@@ -171,6 +171,10 @@ impl ExperimentEnrollment {
         } else {
             let enrollment =
                 evaluate_enrollment(available_randomization_units, experiment, targeting_helper)?;
+            debug!(
+                "Evaluating experiment slug: {:?} with targeting string: {:?}",
+                experiment.slug, experiment.targeting
+            );
             debug!(
                 "Experiment '{}' is new - enrollment status is {:?}",
                 &enrollment.slug, &enrollment