[PR] Core: Resolve new column names in UpdateSchema update and move methods [iceberg]

["yusufyildiz34 (via GitHub)" <gi...@apache.org>]

yusufyildiz34 opened a new pull request, #18627:
URL: https://github.com/apache/iceberg/pull/18627

   Within one `UpdateSchema`, the update and move methods only resolved columns by their original names, so `renameColumn("data", "payload").moveFirst("payload")` failed with "Cannot move missing column". `SchemaUpdate` now also tracks each column's pending new name and uses it in `updateColumn`, `updateColumnDoc`, `updateColumnDefault`, `requireColumn`, `makeColumnOptional` and the move methods when the name doesn't match an existing or added column, so original names keep working as before. A name freed by `deleteColumn` resolves to the column renamed to it. `deleteColumn`, `renameColumn` and `addColumn` still use original names, and children of a renamed struct still need the struct's original name. This picks up #12202, which the stale bot closed (see also #10830).
   
   Closes #16581
   
   Test plan: updating and moving a renamed column by its new name works for top-level and nested columns, by short and full name, case-insensitively, and after the original name was deleted (all fail on main); a name replaced by a second rename no longer resolves.
   
   ---
   **AI Disclosure**
   - Model: Claude Opus 5.5
   - Platform/Tool: Claude Code
   - Human Oversight: fully reviewed
   - Prompt Summary: Fix #16581 so UpdateSchema update and move methods accept a column's new name after renameColumn in the same update; the fix and its tests are generated.
   


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