[ft-benchmark] remove lock file after successful run

[MCJOHN974]

Of course we want remove lock after a successful run, not only after fails during benchmark execution

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.79%. Comparing base (ad0647b) to head (aabb5a6).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11834      +/-   ##
==========================================
- Coverage   71.81%   71.79%   -0.03%     
==========================================
  Files         796      796              
  Lines      163333   163333              
  Branches   163333   163333              
==========================================
- Hits       117302   117261      -41     
- Misses      40975    41020      +45     
+ Partials     5056     5052       -4     

Flag	Coverage Δ
backward-compatibility	0.23% <ø> (ø)
db-migration	0.23% <ø> (ø)
genesis-check	1.35% <ø> (ø)
integration-tests	37.78% <ø> (-0.04%)	⬇️
linux	71.55% <ø> (-0.03%)	⬇️
linux-nightly	71.36% <ø> (-0.02%)	⬇️
macos	54.68% <ø> (-0.02%)	⬇️
pytests	1.62% <ø> (ø)
sanity-checks	1.42% <ø> (ø)
unittests	66.24% <ø> (-0.11%)	⬇️
upgradability	0.28% <ø> (ø)

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