Add conversation-history instrumentation tests for LlmModule (#19679) #5696

Job	Run time
test-coreml / test-backend-macos (coreml, operators) / macos-job	14m 30s
test-coreml / test-backend-macos (coreml, models) / macos-job	14m 29s
test-coreml / test-backend-linux	-1s
test-coreml / package-golden-artifacts	-1s
	28m 57s

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