fix: prevent coverage threshold failures in CI

[mrgrain]

This PR adds a step to the codecov workflow that resets all coverage thresholds to empty objects before running tests. This ensures that the codecov job never fails due to coverage thresholds not being met, allowing it to simply collect and report coverage data to codecov.

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.78%. Comparing base (860c229) to head (4e69597).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #490      +/-   ##
==========================================
+ Coverage   79.17%   79.78%   +0.60%     
==========================================
  Files          54       54              
  Lines        6914     6914              
  Branches      774      779       +5     
==========================================
+ Hits         5474     5516      +42     
+ Misses       1422     1378      -44     
- Partials       18       20       +2     

Flag	Coverage Δ
suite.unit	79.78% <ø> (+0.60%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ 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.