Add coverage_stats metric to inner loop to increase output.

[nharper285]

Summary of the Pull Request

What is this about?

PR Checklist

• Applies to work item: #xxx
• CLA signed. If not, go over here and sign the CLI.
• Tests added/passed
• Requires documentation to be updated
• I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

Info on Pull Request

What does this include?

Validation Steps Performed

How does someone test & validate?

[mgreisen]

How were you able to test?

[nharper285]

How were you able to test?
I tested using the local fuzzing feature, using a manual deployment, and check-pr!

[codecov-commenter]

Codecov Report

Merging #3607 (2c13e42) into main (d50fd48) will decrease coverage by 0.01%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #3607      +/-   ##
==========================================
- Coverage   39.95%   39.94%   -0.01%     
==========================================
  Files         303      303              
  Lines       37724    37719       -5     
  Branches     1738     1738              
==========================================
- Hits        15073    15068       -5     
  Misses      22330    22330              
  Partials      321      321              

Files	Coverage Δ
...c/agent/onefuzz-task/src/tasks/coverage/generic.rs	88.44% <100.00%> (+0.37%)	⬆️

... and 1 file with indirect coverage changes