Only collect and report per-program-timings when Trace is enabled

[tao-stones]

Problem

• per-program-timings stats are always collected for each instruction executed, but only reported to metrics at trace level.
• per-program-timings can be handy when debugging SVM to identify expensive programs, it should be kept.

Summary of Changes

• move collecting and reporting behind log::log_enabled!(log::Level::Trace)

Fixes #6110

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.00000% with 17 lines in your changes missing coverage. Please review.

Project coverage is 82.9%. Comparing base (1f81db6) to head (828c5fc).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #6140     +/-   ##
=========================================
- Coverage    82.9%    82.9%   -0.1%     
=========================================
  Files         842      842             
  Lines      377482   377488      +6     
=========================================
- Hits       312964   312954     -10     
- Misses      64518    64534     +16     

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