Add IS_UNKNOWN operator test in Arrow Adapter #14101

Job	Run time
Windows (JDK 17)	17m 32s
Windows (JDK 8)	16m 8s
Linux (JDK 8, oldest Guava, America/New_York Timezone)	11m 12s
Windows (JDK 21)	15m 30s
Linux (JDK 11, Pacific/Chatham Timezone)	10m 50s
Linux (JDK 8, latest Guava, America/New_York Timezone)	12m 2s
Linux (JDK 21)	12m 22s
Linux (JDK 17)	10m 47s
Linux (JDK 11, Avatica main)	16m 41s
Linux (JDK 23)	10m 16s
ErrorProne (JDK 11, latest Guava)	6m 20s
macOS (JDK 21)	41m 39s
CheckerFramework (JDK 11)	13m 9s
CheckerFramework (JDK 11, oldest Guava)	13m 1s
Druid Tests	9m 18s
Linux (JDK 8) Slow Tests	0s
	3h 36m 47s

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