[Flink] Reduce excessively long thread sleep

[waywtdcc]

This pull request fixes #5891 Reduce excessively long thread sleep

[pan3793]

@waywtdcc thanks for your contribution, please restore the PR description template and fill it in seriously, the detailed change description and review history are extremely important to an open-source project.

[pan3793]

@link3280 @YesOrNo828 do you have suggestions/concerns on changing this value? Or maybe we should make it configurable?

[link3280]

The default fetch interval is the same as CliTableResultView in Flink SQL client, which I think is a reasonable default.

I would rather make it configurable if necessary.

[YesOrNo828]

+1 make it configurable.