Fix racy tests

[mstoykov]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1486 into new-schedulers will decrease coverage by 0.03%.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           new-schedulers    #1486      +/-   ##
==================================================
- Coverage           76.79%   76.75%   -0.04%     
==================================================
  Files                 163      163              
  Lines               13008    13008              
==================================================
- Hits                 9989     9984       -5     
- Misses               2508     2513       +5     
  Partials              511      511              

Impacted Files	Coverage Δ
lib/executor/variable_looping_vus.go	95.25% <0.00%> (-1.19%)	⬇️
stats/cloud/collector.go	78.08% <0.00%> (-0.62%)	⬇️

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