Add information from written files to Iceberg conflict detection #24470
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Description
Currently, Iceberg's concurrent write conflict detection is based on predicates received from the engine. In more complicated cases (like joins, merges, or different type comparisons), this information is not available at the connector level.
This PR aims to take partition information from the actual written files as a source for the conflict detection system. If, during a write, created files are only for some partitions, we can check only those partitions for potential conflicts from concurrent writes.
Additional context and related issues
Release notes
( ) This is not user-visible or is docs only, and no release notes are required.
( ) Release notes are required. Please propose a release note for me.
( ) Release notes are required, with the following suggested text: