fix(sink): fix sink_decouple = false and commit_checkpoint_interval defalut = 1;

[xxhZs]

fix ci

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What's changed and what's your intention?

in this pr;
if sink_decouple = true/defalut default commit_checkpoint_interval = 10;
if sink_decouple = false default commit_checkpoint_interval = 1;
if sink_decouple = false and set commit_checkpoint_interval > 1 return error

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[chenzl25]

LGTM. This PR set the commit_checkpoint_interval for sinks in frontend.