fix: welcome handler

[anchenyi]

https://msazure.visualstudio.com/Microsoft%20Teams%20Extensibility/_workitems/edit/30591188

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.17%. Comparing base (0f28551) to head (d6105cf).
Report is 2 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff            @@
##              dev   #12957    +/-   ##
========================================
  Coverage   90.17%   90.17%            
========================================
  Files         581      581            
  Lines       34742    34746     +4     
  Branches     6959     6839   -120     
========================================
+ Hits        31327    31331     +4     
  Misses       1498     1498            
  Partials     1917     1917            

Files with missing lines	Coverage Δ
...s/vscode-extension/src/handlers/controlHandlers.ts	92.30% <100.00%> (+0.35%)	⬆️