feat: add help link

[anchenyi]

task: https://msazure.visualstudio.com/Microsoft%20Teams%20Extensibility/_workitems/edit/27423878

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.42%. Comparing base (c90ed40) to head (6b036cd).
Report is 2 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #11663   +/-   ##
=======================================
  Coverage   88.42%   88.42%           
=======================================
  Files         535      535           
  Lines       32636    32636           
  Branches     6312     6369   +57     
=======================================
  Hits        28857    28857           
  Misses       1837     1837           
  Partials     1942     1942           

Files	Coverage Δ
...src/component/driver/teamsApp/validateTestCases.ts	95.86% <100.00%> (ø)