Remove step-trace and trace features

[akoshelev]

Those were used to generate steps graph at runtime, but we've migrated to the new step engine that generates it at compile time, so we no longer need a script and this set of features

[codecov]

Codecov Report

Attention: Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.

Project coverage is 92.72%. Comparing base (77ac0b0) to head (411c771).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
ipa-core/src/telemetry/step_stats.rs	0.00%	4 Missing ⚠️
ipa-core/src/test_fixture/world.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1248      +/-   ##
==========================================
- Coverage   92.73%   92.72%   -0.01%     
==========================================
  Files         200      200              
  Lines       31486    31470      -16     
==========================================
- Hits        29197    29182      -15     
+ Misses       2289     2288       -1     

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