Remove "dumping rbe metrics" message

The issue where RBE was taking a long time has been fixed, so this
message isn't that important anymore, and it was overriding the last
ephemeral status message that soong output.

Test: Presubmits
Change-Id: I019f351a3307176ec7b4786d4387fde9061ba08b

ui/build/rbe.go

@@ -183,8 +183,6 @@ func DumpRBEMetrics(ctx Context, config Config, filename string) {
 		return
 	}
 
-	ctx.Status.Status("Dumping rbe metrics...")
-
 	outputDir := config.rbeProxyLogsDir()
 	if outputDir == "" {
 		ctx.Fatal("RBE output dir variable not defined. Aborting metrics dumping.")