branch-4.0: [fix](mv) Fix stats unknown when calc sync mv plan statistics #58426 #58789
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### What problem does this PR solve? Related PR: #36760 #57850 Problem Summary: Fix stats unknown when calc sync mv plan statistics For SQLs that are related to statistics, we should not collect or compute statistics. Previously this was determined by the `isInternal` flag, but `isInternal` is too broad: it covers not only statistics-related SQL but also SQL used to generate materialized view plans. Materialized view plan generation requires statistics, so we introduce a new flag `isPlanWithUnKnownColumnStats` to indicate connections that are used for statistics-only operations (treat column statistics as unknown).
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Cherry-picked from #58426