chore: revert "refactor(cli/unstable): string based ProgressBar tests (#6679)"

[kt3k]

This reverts commit e10c71a which introduced some flakiness in CI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.71%. Comparing base (e10c71a) to head (08cfbeb).
Report is 17 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6684   +/-   ##
=======================================
  Coverage   94.71%   94.71%           
=======================================
  Files         567      567           
  Lines       46778    46778           
  Branches     6582     6582           
=======================================
+ Hits        44305    44306    +1     
+ Misses       2431     2430    -1     
  Partials       42       42           

☔ 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.

[kt3k]

This is no longer necessary as we chose to use FakeTime for reducing flakiness. #6686