feat: support full definitions of MCP tools on stable ATK

[Alive-Fish]

https://msazure.visualstudio.com/Microsoft%20Teams%20Extensibility/_workitems/edit/36894404

[codecov]

Codecov Report

❌ Patch coverage is 91.17647% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.26%. Comparing base (c12e5f4) to head (dd09f12).
⚠️ Report is 3 commits behind head on release/6.6.

Files with missing lines	Patch %	Lines
...code-extension/src/handlers/updateActionWithMCP.ts	93.93%	0 Missing and 2 partials ⚠️
...scode-extension/src/chat/commands/create/helper.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release/6.6   #15569      +/-   ##
===============================================
+ Coverage        89.24%   89.26%   +0.02%     
===============================================
  Files              620      620              
  Lines            38092    38123      +31     
  Branches          7550     7746     +196     
===============================================
+ Hits             33995    34031      +36     
+ Misses            1988     1983       -5     
  Partials          2109     2109              

Files with missing lines	Coverage Δ
...scode-extension/src/chat/commands/create/helper.ts	14.81% <0.00%> (ø)
...code-extension/src/handlers/updateActionWithMCP.ts	95.16% <93.93%> (+0.96%)	⬆️

... and 1 file with indirect coverage changes

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