core: fixed flakey scheduler test

[pinebit]

Fixed flakey TestSchedulerWait.

category: test
ticket: #3988

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.35%. Comparing base (538d700) to head (22ffcb2).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4064      +/-   ##
==========================================
+ Coverage   56.32%   56.35%   +0.02%     
==========================================
  Files         241      241              
  Lines       30861    30861              
==========================================
+ Hits        17383    17391       +8     
+ Misses      11207    11200       -7     
+ Partials     2271     2270       -1     

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