[FLINK-22002][tests] Let taskmanager.slot.timeout fall back to akka.ask.timeout

[tillrohrmann]

This commit lets taskmanager.slot.timeout fall to akka.ask.timeout so that the MiniCluster
will run by default with a 5 min taskmanager.slot.timeout. This should harden against CI
pauses.

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[zentol]

shouldn't we explicitly configure this now in flink-conf.yaml to not change the current production behavior? (in particular for the 1.13 backport)

[tillrohrmann]

I am not sure whether this change made sense in the first place, tbh. Per default you probably want to have the same timeout as you give your RPCs. If you want to have a smaller timeout, then you configure it explicitly.

[tillrohrmann]

@flinkbot run azure.

[tillrohrmann]

The build is now passing. The problem was that the taskmanager.slot.timeout did not have a default value. Feel free to give it another pass @zentol.

[tillrohrmann]

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