Add LlmIntentClassifier and chat-to-proposal integration tests #996

Job	Run time
API Integration / API Integration (ubuntu-latest)	1m 14s
Backend Unit / Backend Unit (ubuntu-latest)	52s
Backend Unit / Backend Unit (windows-latest)	1m 26s
Docs Governance / Docs Governance	12s
Backend Architecture / Backend Architecture	24s
API Integration / API Integration (windows-latest)	2m 24s
Frontend Unit / Frontend Unit (windows-latest)	4m 33s
Frontend Unit / Frontend Unit (ubuntu-latest)	1m 17s
Container Images / Container Images	1m 19s
E2E Smoke / E2E Smoke	2m 15s
	15m 56s

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