scplan: make EXPLAIN target output stable #86318
Merged
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This commit does not make any functional changes. It merely ensures that
the diagrams generated by an EXPLAIN (DDL) statement list the schema
change targets in a predefined order: first the to-public targets, then
the transient targets, and finally the to-absent targets.
This helps readability and makes the declarative schema changer
data-driven test output more stable.
Release justification: low-impact, test-only change
Release note: None