fix: Write copilot debug log to file

[samwelkanda]

Fixes missing copilot log file with function execution details

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.28%. Comparing base (b46a7e3) to head (3d132d2).
Report is 35 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #13077      +/-   ##
==========================================
+ Coverage   90.21%   90.28%   +0.07%     
==========================================
  Files         581      583       +2     
  Lines       34871    35061     +190     
  Branches     6847     6840       -7     
==========================================
+ Hits        31458    31654     +196     
+ Misses       1488     1478      -10     
- Partials     1925     1929       +4     

Files with missing lines	Coverage Δ
...ension/src/pluginDebugger/copilotDebugLogOutput.ts	89.18% <100.00%> (+5.18%)	⬆️

... and 24 files with indirect coverage changes