[repo-ci] Switch to using dotnet tool install in docfx workflow

[CodeBlanch]

Changes

• Switch to using dotnet tool install instead of choco install to obtain docfx in docfx.yml

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.41%. Comparing base (6250307) to head (2ac2dc0).
Report is 195 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5573      +/-   ##
==========================================
+ Coverage   83.38%   85.41%   +2.02%     
==========================================
  Files         297      282      -15     
  Lines       12531    12216     -315     
==========================================
- Hits        10449    10434      -15     
+ Misses       2082     1782     -300     

Flag	Coverage Δ
unittests	?
unittests-Instrumentation-Experimental	83.95% <ø> (?)
unittests-Instrumentation-Stable	83.95% <ø> (?)
unittests-Solution-Experimental	85.52% <ø> (?)
unittests-Solution-Stable	85.38% <ø> (?)
unittests-Unstable-Core	19.86% <ø> (?)

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see 79 files with indirect coverage changes