Check InterruptPending instead of InterruptPending in cdbdisp_dispatchX

[fanfuxiaoran]

When dispatching command to segments, if the 'cancelOnError' is true and the query is being canceled, it will bail out. But before this pr, it check the 'InterruptPending' to see if there is a cancel request. When the process got a singal, like customer signal, not a query cancel request, it will cancle the query too.

So I use the QueryCancelPending instead of InterrupPending here.

fix #ISSUE_Number

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[fanfuxiaoran]

Using https://github.com/cloudberrydb/cloudberrydb/pull/631 instead.