chore: remove unused code (#125) #27

Job	Run time
Build, Tag, and Push Image (mapt-event-time-filter-function)	1m 46s
Build, Tag, and Push Image (flat-map-stream)	1m 43s
Build, Tag, and Push Image (map-flatmap)	1m 34s
Build, Tag, and Push Image (even-odd)	1m 15s
Build, Tag, and Push Image (simple-sink)	1m 8s
Build, Tag, and Push Image (reduce-sum)	1m 20s
Build, Tag, and Push Image (reduce-stream-sum)	1m 41s
Build, Tag, and Push Image (map-forward-message)	1m 22s
Build, Tag, and Push Image (reduce-counter)	1m 32s
Build, Tag, and Push Image (sideinput-example)	1m 20s
Build, Tag, and Push Image (udf-sideinput-example)	1m 34s
Build, Tag, and Push Image (source-simple-source)	1m 10s
Build, Tag, and Push Image (session-reduce-count)	1m 27s
	18m 52s

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