refactor(async/unstable): improve circuit breaker defaults and readability

[tomas-zijdemans]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.18%. Comparing base (13e5527) to head (fcc2f3a).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6917   +/-   ##
=======================================
  Coverage   94.17%   94.18%           
=======================================
  Files         584      584           
  Lines       43087    43078    -9     
  Branches     6875     6876    +1     
=======================================
- Hits        40578    40572    -6     
+ Misses       2457     2455    -2     
+ Partials       52       51    -1     

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[kt3k]

LGTM