s3: use the same bucket by VU for the entire load test

[carpawell]

Change load expectation try. Maybe eventually merged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 2.50%. Comparing base (224f35f) to head (ad56432).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #113   +/-   ##
======================================
  Coverage    2.50%   2.50%           
======================================
  Files          11      11           
  Lines         758     758           
======================================
  Hits           19      19           
  Misses        739     739           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.