[FLINK-21387][tests] Remove test timeout from DispatcherTest.testNonBlockingJobSubmission and .testInvalidCallDuringInitialization

[tillrohrmann]

The 5s test timeout for the DispatcherTest.testNonBlockingJobSubmission and .testInvalidCallDuringInitialization failed on the CI infrastructure. Therefore, this commit removes these timeouts in order to harden the mentioned tests.

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Last check on commit 4363083 (Tue Mar 23 13:17:46 UTC 2021)

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CI report:

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[XComp]

The reasoning makes sense. I verified your findings in the logs. The change looks good to me. 👍

[tillrohrmann]

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