[FLINK-35597][test] Fix unstable LocatableSplitAssignerTest#testConcurrentSplitAssignmentForMultipleHosts

[liyubin117]

Brief change log

• To ensure at least one fraction of hosts to be local, it should be ia.getNumberOfLocalAssignments() as before.

[1996fanrui]

Thanks @liyubin117 for the fix!

LGTM

cc @GOODBOY008 , it's caused by #24881

[flinkbot]

CI report:

• 971edbe Azure: SUCCESS

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• @flinkbot run azure re-run the last Azure build

[GOODBOY008]

LGTM

[GOODBOY008]

@1996fanrui It's indeed my mistake. @liyubin117 Great catch.

[liyubin117]

@1996fanrui @GOODBOY008 Thanks for your attention, I found that CI e2e tests have stucked for hours, As the code is about to be frozen, could you help cancel some tasks? For example, this task has already failed but is still running the e2e test.
https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=60262&view=results

[1996fanrui]

@1996fanrui @GOODBOY008 Thanks for your attention, I found that CI e2e tests have stucked for hours, As the code is about to be frozen, could you help cancel some tasks? For example, this task has already failed but is still running the e2e test. https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=60262&view=results

No worries, the bugfix still can be merged after feature freeze. The feature cannot be merged after feature freeze.

Let's wait for the CI for a while.