feat(template): replace teamsfx with teams-ai in notification express

[tecton]

https://msazure.visualstudio.com/Microsoft%20Teams%20Extensibility/_workitems/edit/30470875

Sending notification to person is not supported yet in team-ai library.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.17%. Comparing base (038ce65) to head (39d93e4).
Report is 8 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #12958      +/-   ##
==========================================
+ Coverage   90.14%   90.17%   +0.02%     
==========================================
  Files         581      581              
  Lines       34850    34742     -108     
  Branches     6770     6779       +9     
==========================================
- Hits        31415    31327      -88     
+ Misses       1509     1498      -11     
+ Partials     1926     1917       -9     

see 5 files with indirect coverage changes