Execution segment sequences

[na--]

The remaining work that was slated for this PR would be done in #1323 instead

[codecov-io]

Codecov Report

Merging #1318 into new-schedulers will increase coverage by 0.01%.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           new-schedulers    #1318      +/-   ##
==================================================
+ Coverage           75.23%   75.25%   +0.01%     
==================================================
  Files                 159      159              
  Lines               12345    12397      +52     
==================================================
+ Hits                 9288     9329      +41     
- Misses               2568     2578      +10     
- Partials              489      490       +1     

Impacted Files	Coverage Δ
lib/helpers.go	95.83% <0.00%> (-4.17%)	⬇️
stats/cloud/collector.go	79.62% <0.00%> (+0.62%)	⬆️
lib/executor/vu_handle.go	94.28% <0.00%> (+1.42%)	⬆️
lib/executor/per_vu_iterations.go	96.62% <0.00%> (+2.24%)	⬆️

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