docs: replace circleci badge with an authenticated shield

[zimeg]

Changelog

N/A - Fixes an issue that appears with adjacent experiments 🤓 🧪

Summary

This PR replaces the circleci badge with an authenticated shield. This allows us to continue sharing status of our development builds on main without exposing logs related to code signing.

Preview

Notes

📚 https://circleci.com/docs/guides/integration/status-badges/#creating-badges-for-private-repositories

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.31%. Comparing base (908239f) to head (4c77621).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #537      +/-   ##
==========================================
- Coverage   71.34%   71.31%   -0.03%     
==========================================
  Files         222      222              
  Lines       18706    18706              
==========================================
- Hits        13345    13341       -4     
- Misses       4183     4187       +4     
  Partials     1178     1178              

☔ 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.

[mwbrooks]

❤️

[zimeg]

@mwbrooks I appreciate the kind encouragement and careful reviews toward better 🥲💌