Additionally Generate Coverage from Any Usage of bin/benchpark if Environment Variable Provided

[michaelmckinsey1]

Description

• Currently our codecoverage is only tracking the pytest testing, which is a subset of our CI. This PR adds additional reporting to codecoverage for:
  • GitHub dryruns (8x matrix runs)
  • Saxpy binary execution test (1x)
• Coverage boosted by +23%
• Depends on Automatically Enumerate Dryruns and MpiOnlyExperiment #904
• There would be an additional boost if we could figure this out for gitlab tests, but this would be a big lift.

Adding/modifying core functionality, CI, or documentation:

• Update bin/benchpark to run coverage if environment variable BENCHPARK_RUN_COVERAGE is set
• Update .github and `codecov.yml to implement and support extra coverage uploads
• Update dev docs to explain coverage

[michaelmckinsey1]

Ready if passing CI

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.44%. Comparing base (2e52600) to head (3e12646).
⚠️ Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #891       +/-   ##
============================================
+ Coverage    41.75%   65.44%   +23.69%     
============================================
  Files           24       45       +21     
  Lines         1583     3094     +1511     
  Branches       231      231               
============================================
+ Hits           661     2025     +1364     
- Misses         872     1061      +189     
+ Partials        50        8       -42     

see 33 files with indirect coverage changes

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