ActionOwner references only BuildEvent instead of full BuildConfiguration

This reduces the size of its serialized representation.

PiperOrigin-RevId: 188597127
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/TargetConfiguredEvent.java b/src/main/java/com/google/devtools/build/lib/analysis/TargetConfiguredEvent.java
index db6bea2..daa08d9 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/TargetConfiguredEvent.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/TargetConfiguredEvent.java
@@ -45,7 +45,7 @@
     ImmutableList.Builder<BuildEvent> builder = new ImmutableList.Builder<>();
     for (BuildConfiguration config : configurations) {
       if (config != null) {
-        builder.add(config);
+        builder.add(config.toBuildEvent());
       } else {
         builder.add(new NullConfiguration());
       }