ci(benchmarks): update benchmark workflow for push on master

[sw360cab]

Restructuring Benchmarks workflow in the following way

• Reducing workflows for benchmarks to a single one (instead of two different ones)
• Workflow is triggered only when PR is finally merged with master branch
• There is a single flow of benchmarks performance to verify
• Benchmarks do not impact PR
• An Alert is automatically added as comment to each commit when regressions are introduced respect to previous results

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.95%. Comparing base (a2b4d4b) to head (0b8f66e).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2891   +/-   ##
=======================================
  Coverage   60.95%   60.95%           
=======================================
  Files         564      564           
  Lines       75273    75273           
=======================================
+ Hits        45885    45886    +1     
- Misses      26018    26019    +1     
+ Partials     3370     3368    -2     

Flag	Coverage Δ
contribs/gnodev	61.46% <ø> (ø)
contribs/gnofaucet	15.31% <ø> (+0.85%)	⬆️
gno.land	67.92% <ø> (ø)
gnovm	65.77% <ø> (ø)
misc/genstd	80.54% <ø> (ø)
misc/logos	19.88% <ø> (-0.36%)	⬇️
tm2	62.11% <ø> (+0.04%)	⬆️

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