fix: emit KiroChatMessageEvent to STE for every GenerateAssistantResponse request

[chungjac]

Problem

Product needs metrics for enterprises. Therefore, backend has added a new KiroChatMessageEvent STE event which the client should send for every GenerateAssistantResponse request.

Solution

We will now also send KiroChatMessageEvent every time we send a request to GenerateAssistantResponse

2026-01-23 16:58:52.945 [info] [Info  - 4:58:52 PM] [2026-01-24T00:58:52.937Z] lserver: Invoking SendTelemetryEvent:KiroChatMessageEvent:
            "conversationId": 0fdb8000-cb73-4cb5-b7fe-3dfa6750bc2d
            "messageId": d5a8dad2-b568-4b5a-b0e8-17f760364e15
            "origin": IDE
            "userId": 247244f5-c22e-4505-a6ff-1d7194db2796
            "date": 2026-01-24
            "profileId": arn:aws:codewhisperer:us-west-2:724904587780:profile/KGGD9MM7EMNX
            "chatAgentMode": VIBE
            "chatAutonomyMode": AUTOPILOT
            "chatMessageDuration": 2827
            "modelId": CLAUDE_SONNET_4_20250514_V1_0

Testing

Confirmed that the metric shape follows smithy model provided by backend team

Tested in RTS alpha

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 89.83051% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.65%. Comparing base (dedec0d) to head (705ac89).

Files with missing lines	Patch %	Lines
...whisperer/src/shared/telemetry/telemetryService.ts	91.11%	4 Missing ⚠️
...nguage-server/agenticChat/agenticChatController.ts	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2594      +/-   ##
==========================================
+ Coverage   60.60%   60.65%   +0.04%     
==========================================
  Files         278      278              
  Lines       65099    65152      +53     
  Branches     4145     4153       +8     
==========================================
+ Hits        39451    39515      +64     
+ Misses      25564    25553      -11     
  Partials       84       84              

Flag	Coverage Δ
unittests	60.65% <89.83%> (+0.04%)	⬆️

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