Merge duplicated wildcard arms in LogicalPlanBuilder project_with_validation #26308

Is your feature request related to a problem or challenge?

In project_with_validation (expr/src/logical_plan/builder.rs#L2087-L2174), the Wildcard arm (about L2100-L2118) and the QualifiedWildcard arm (about L2119-L2139) are near-identical. Both duplicate the REPLACE handling and the validate branch (normalize then columnize, or pass through), and the validate branch is repeated a third time in the Expression arm. The two wildcard arms differ only in how the expanded expressions are produced.

Describe the solution you'd like

Add two small helpers, push_validated(expr, validate) and apply_replace(expanded, replace), so each wildcard arm only computes its expansion and the rest is shared. The existing wildcard and REPLACE tests cover the behaviour.

Describe alternatives you've considered

None.

Additional context

This is small and self-contained, a good first issue. Line references are pinned to commit 0d79252.