Website: add step to the /start questionnaire for users who don't want to use Fleet (#19514)

Closes: https://github.com/fleetdm/confidential/issues/6287

Changes:
- Added a new page to the /start questionnaire where users can let us
know they're not interested in using Fleet.

website/api/controllers/save-questionnaire-progress.js

@@ -28,6 +28,7 @@ module.exports = {
         'self-hosted-deploy',
         'whats-left-to-get-you-set-up',
         'how-was-your-deployment',
+        'thanks-for-checking-out-fleet',
       ]
     },
     formData: {
@@ -211,6 +212,8 @@ module.exports = {
         } else if(['yes-recently-deployed'].includes(hasUsedFleetAnswer)){
           psychologicalStage = '5 - Personally confident';
         } else { require('assert')(false, 'This should never happen.'); }
+      } else if(currentStep === 'thanks-for-checking-out-fleet') {
+        psychologicalStage = '2 - Aware';
       }//fi
     }//fi