fix(template): add ignored project files

[tecton]

bug: https://msazure.visualstudio.com/Microsoft%20Teams%20Extensibility/_workitems/edit/31792309

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.36%. Comparing base (aee2965) to head (ad2457c).
Report is 2 commits behind head on release/5.14.

Additional details and impacted files

@@              Coverage Diff               @@
##           release/5.14   #13425    +/-   ##
==============================================
  Coverage         90.36%   90.36%            
==============================================
  Files               620      620            
  Lines             36993    36993            
  Branches           7375     7185   -190     
==============================================
  Hits              33428    33428            
  Misses             1535     1535            
  Partials           2030     2030            

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