Make sure you can't run with both --cpu and --collectProfileRun (#4298)

lib/cli/cli.js

@@ -98,6 +98,10 @@ function validateInput(argv) {
     return 'Error: Getting CrUx data do not work running in multi mode.';
   }
 
+  if (argv.browsertime.cpu && argv.browsertime.enableProfileRun) {
+    return 'Error: Use either --cpu or --enableProfileRun. Profile run will run one extra iteration to collect cpu/trace data.';
+  }
+
   if (
     argv.urlAlias &&
     argv._ &&
@@ -573,13 +577,13 @@ export async function parseCommandLine() {
       alias: 'enableProfileRun',
       type: 'boolean',
       describe:
-        'Make one extra run that collects the profiling trace log (no other metrics is collected). For Chrome it will collect the timeline trace, for Firefox it will get the Geckoprofiler trace. This means you do not need to get the trace for all runs and can skip the overhead it produces.'
+        'Make one extra run that collects the profiling trace log (no other metrics is collected). For Chrome it will collect the timeline trace, for Firefox it will get the Geckoprofiler trace. This means you do not need to get the trace for all runs and can skip the overhead it produces. You should not run this together with --cpu since that will get a trace for every iteration.'
     })
     .option('browsertime.enableVideoRun', {
       alias: 'enableVideoRun',
       type: 'boolean',
       describe:
-        'Make one extra run that collects video and visual metrics. This means you can do your runs with --visualMetrics true --video false --enableVideoRun true to collect visual metrics from all runs and save a video from the profile/video run. If you run it together with --enableProfileRun it will also collect profiling trace.'
+        'Make one extra run that collects video and visual metrics. This means you can do your runs with --visualMetrics true --video false --enableVideoRun true to collect visual metrics from all runs and save a video from the profile/video run. If you run it together with --enableProfileRun it will also collect profiling race.'
     })
     .option('browsertime.videoParams.filmstripFullSize', {
       alias: 'videoParams.filmstripFullSize',