fix: cleanup async

[mdjastrzebski]

Summary

Scope:

• add cleanuAsync
• export it publicly
• call it during cleanup (instead of sync cleanup)

Test plan

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.06%. Comparing base (2015fb8) to head (413e200).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1817      +/-   ##
==========================================
+ Coverage   89.94%   90.06%   +0.12%     
==========================================
  Files          98       98              
  Lines        5856     5867      +11     
  Branches      605      949     +344     
==========================================
+ Hits         5267     5284      +17     
+ Misses        584      578       -6     
  Partials        5        5              

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