Resolve metrics_proto warning

Bug: 271526845
Test: manually invoke internal protobuf presubmit
Change-Id: I79d1cc027e422fa1ca6106f5b45ef11045f6d486

ui/metrics/metrics_proto/metrics.proto

@@ -134,6 +134,12 @@ message MetricsBase {
 }
 
 message BuildConfig {
+  enum NinjaWeightListSource {
+    NOT_USED = 0;
+    NINJA_LOG = 1;
+    EVENLY_DISTRIBUTED = 2;
+  }
+
   optional bool use_goma = 1;
 
   optional bool use_rbe = 2;
@@ -342,9 +348,3 @@ message JobInfo {
   // Description of a job
   optional string job_description = 2;
 }
-
-enum NinjaWeightListSource {
-  NOT_USED = 0;
-  NINJA_LOG = 1;
-  EVENLY_DISTRIBUTED = 2;
-}