[ft-benchmark] run locust in nohup

[MCJOHN974]

Without running locust in nohup, shell script waits until locust finish and only after this run data sender

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.40%. Comparing base (f4557ec) to head (a8efc74).
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11518      +/-   ##
==========================================
+ Coverage   71.34%   71.40%   +0.06%     
==========================================
  Files         787      788       +1     
  Lines      159391   159881     +490     
  Branches   159391   159881     +490     
==========================================
+ Hits       113711   114169     +458     
+ Misses      40752    40742      -10     
- Partials     4928     4970      +42     

Flag	Coverage Δ
backward-compatibility	0.23% <ø> (-0.01%)	⬇️
db-migration	0.23% <ø> (-0.01%)	⬇️
genesis-check	1.36% <ø> (-0.01%)	⬇️
integration-tests	37.69% <ø> (+0.19%)	⬆️
linux	68.83% <ø> (+0.09%)	⬆️
linux-nightly	70.93% <ø> (+0.10%)	⬆️
macos	52.44% <ø> (+0.07%)	⬆️
pytests	1.57% <ø> (-0.01%)	⬇️
sanity-checks	1.37% <ø> (-0.01%)	⬇️
unittests	66.10% <ø> (+0.04%)	⬆️
upgradability	0.28% <ø> (-0.01%)	⬇️

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