[FLINK-23732][tests] Increase logger-startup-timeout to 50s

[tillrohrmann]

In order to harden tests on slow CI, this commit increases the logger-startup-timeout from 30s to 50s.

[dmvk]

LGTM 👍

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[tillrohrmann]

Thanks for the review @dmvk. Merging this PR once Azure gives green light.