renamed License.txt to THIRD-PARTY-NOTICE.txt

[Tanya-Solyanik]

added header per https://github.com/dotnet/runtime/blob/main/docs/project/copyright.md

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.01721%. Comparing base (9e688c0) to head (13d8837).
Report is 1 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #13003         +/-   ##
===================================================
+ Coverage   76.01348%   76.01721%   +0.00373%     
===================================================
  Files           3267        3267                 
  Lines         643428      643428                 
  Branches       47428       47428                 
===================================================
+ Hits          489092      489116         +24     
+ Misses        150765      150750         -15     
+ Partials        3571        3562          -9     

Flag	Coverage Δ
Debug	76.01721% <ø> (+0.00373%)	⬆️
integration	18.03545% <ø> (+0.00665%)	⬆️
production	49.96825% <ø> (+0.00907%)	⬆️
test	96.93626% <ø> (-0.00057%)	⬇️
unit	47.42442% <ø> (+0.00419%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

[merriemcgaw]

lgtm