Enable PR trigger for isolated V123

Author: heathsanchez

.github/workflows/trace-ace-v123-official-reference-scalars.yml

@@ -5,6 +5,11 @@ on:
     paths:
       - 'competitions/trace_the_ace/v123_official_reference_scalars.py'
       - '.github/workflows/trace-ace-v123-official-reference-scalars.yml'
+  pull_request:
+    branches: [agent/trace-ace-mastery-events]
+    paths:
+      - 'competitions/trace_the_ace/v123_official_reference_scalars.py'
+      - '.github/workflows/trace-ace-v123-official-reference-scalars.yml'
   workflow_dispatch:
 jobs:
   test: