feat: enable multiselect for local MCP when creating DA

[rodamore]

Problem

Our current solution only supports adding a single local MCP server during DA creation, even if we discovered many options.

Solution

Enable multiselect when creating a DA with local MCP action to make it easier for devs to include more than one ODR server.

ADO: https://msazure.visualstudio.com/Microsoft%20Teams%20Extensibility/_workitems/edit/36254674

[codecov]

Codecov Report

❌ Patch coverage is 91.17647% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.45%. Comparing base (845b0d2) to head (501def3).
⚠️ Report is 24 commits behind head on dev.

Files with missing lines	Patch %	Lines
.../component/generator/declarativeAgent/generator.ts	91.17%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #15027      +/-   ##
==========================================
+ Coverage   89.44%   89.45%   +0.01%     
==========================================
  Files         605      605              
  Lines       37197    37233      +36     
  Branches     7633     7604      -29     
==========================================
+ Hits        33272    33308      +36     
  Misses       1837     1837              
  Partials     2088     2088              

Files with missing lines	Coverage Δ
packages/fx-core/src/component/generator/utils.ts	97.22% <ø> (ø)
packages/fx-core/src/question/questionNames.ts	100.00% <ø> (ø)
.../src/question/scaffold/vsc/teamsProjectTypeNode.ts	86.51% <ø> (-1.24%)	⬇️
.../component/generator/declarativeAgent/generator.ts	93.75% <91.17%> (-1.34%)	⬇️

... and 6 files with indirect coverage changes

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