Wrap ExecutionMetrics against future needs

This will allow us to extend ExecutionMetrics in the future.

Bug: b/365537477
Test: manual, TH
Change-Id: Icfc3d95ee61b19921e23252276a93984baf1f2e1
diff --git a/cmd/soong_ui/main.go b/cmd/soong_ui/main.go
index c119823..7926292 100644
--- a/cmd/soong_ui/main.go
+++ b/cmd/soong_ui/main.go
@@ -197,7 +197,7 @@
 	rbeMetricsFile := filepath.Join(logsDir, c.logsPrefix+"rbe_metrics.pb")
 	soongBuildMetricsFile := filepath.Join(logsDir, c.logsPrefix+"soong_build_metrics.pb")
 	buildTraceFile := filepath.Join(logsDir, c.logsPrefix+"build.trace.gz")
-	executionMetricsFile := filepath.Join(logsDir, c.logsPrefix+"soong_execution_metrics.pb")
+	executionMetricsFile := filepath.Join(logsDir, c.logsPrefix+"execution_metrics.pb")
 
 	metricsFiles := []string{
 		buildErrorFile,        // build error strings