[SS-166] Widen dimension : u8 to i32 when writing Array values to Iceberg.#36972
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This bug and fix is essentially the same thing as:
https://linear.app/materializeinc/issue/SS-143/iceberg-failed-to-convert-row-to-recordbatch-failed-to-add-insert-row
#36500
Iceberg doesn't have unsigned ints or ints narrower than 32 bits. So if we need to write an Array value, the (normally u8) dimension must be stored as i32.