fix: Wrong order of libraries info in instrumentation (#1196)

Author: losalex

google-cloud-logging/src/main/java/com/google/cloud/logging/Instrumentation.java

@@ -163,8 +163,7 @@ private static ListValue generateLibrariesList(
  }
  Struct libraryInfo = createInfoStruct(libraryName, libraryVersion);
  ListValue.Builder libraryList = ListValue.newBuilder();
- // Append first the library info for this library
- libraryList.addValues(Value.newBuilder().setStructValue(libraryInfo).build());
+ // First add instrumentation data of other libraries to a list if any
  if (existingLibraryList != null) {
  for (Value val : existingLibraryList.getValuesList()) {
  if (val.hasStructValue()) {
@@ -190,6 +189,8 @@ private static ListValue generateLibrariesList(
  }
  }
  }
+ // At last, append this library info to a list
+ libraryList.addValues(Value.newBuilder().setStructValue(libraryInfo).build());
  return libraryList.build();
  }