[FLINK-22142][ci] Don't log Kafka connector output to the AZP console

[tillrohrmann]

This commit removes the console logging of the Kafka connector to the AZP console.

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Last check on commit 0fd332f (Fri May 28 09:00:47 UTC 2021)

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[rmetzger]

Thanks a lot for fixing this!

[tillrohrmann]

Thanks for the review @rmetzger. Merging this PR now.