release-19.1: sql: validate computed columns during ALTER TABLE #36575
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Backport 1/1 commits from #36518.
/cc @cockroachdb/release
Previously these were only validated during CREATE, allowing the creation
of incorrect columns. validateComputedColumn has removed its dependency
on the tree.CreateTable struct so that the alter code can use it. Because
of this, all FKs must be computed prior to the computed validate checks.
Fixes #36036
Release note (bug fix): Correctly validate computed columns during ALTER
TABLE ADD COLUMN.