Add LlmIntentClassifier and chat-to-proposal integration tests #1000

Job	Run time
API Integration / API Integration (ubuntu-latest)	1m 17s
API Integration / API Integration (windows-latest)	2m 15s
Backend Architecture / Backend Architecture	18s
Backend Unit / Backend Unit (ubuntu-latest)	1m 1s
Docs Governance / Docs Governance	10s
Frontend Unit / Frontend Unit (ubuntu-latest)	1m 20s
Container Images / Container Images	1m 22s
Backend Unit / Backend Unit (windows-latest)	2m 5s
Frontend Unit / Frontend Unit (windows-latest)	2m 14s
E2E Smoke / E2E Smoke	2m 11s
	14m 13s

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