Add unit test for ElicitAsync<T> with no `SerializationOptions` #798 #782

Job	Run time
build (ubuntu-latest, Debug)	4m 46s
build (ubuntu-latest, Release)	5m 10s
build (windows-latest, Release)	5m 59s
build (windows-latest, Debug)	6m 58s
build (macos-latest, Debug)	2m 21s
build (macos-latest, Release)	3m 9s
publish-coverage	0s
	28m 23s

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