Reporting coverage on task start up

[nharper285]

Summary of the Pull Request

What is this about? Currently coverage_data is only reported when new_coverage is identified. This PR ensures coverage_data is emitted at the beginning of every task.

PR Checklist

• [ ] Applies to work item: #3472
• [ ] 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?

[codecov-commenter]

Codecov Report

Merging #3502 (905af95) into main (9ede0de) will increase coverage by 0.00%. The diff coverage is 50.00%.

@@           Coverage Diff           @@
##             main    #3502   +/-   ##
=======================================
  Coverage   39.46%   39.47%           
=======================================
  Files         299      299           
  Lines       36316    36318    +2     
=======================================
+ Hits        14332    14335    +3     
+ Misses      21984    21983    -1     

Files Changed	Coverage Δ
src/agent/onefuzz/src/syncdir.rs	24.76% <0.00%> (ø)
...c/agent/onefuzz-task/src/tasks/coverage/generic.rs	87.81% <100.00%> (+0.34%)	:arrow_up: