release-21.1: sql: Test exporting from REGIONAL BY ROW tables #63083
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Backport 1/1 commits from #62899.
/cc @cockroachdb/release
Add a test case which validates that we get the correct symantics when
exporting from REGIONAL BY ROW TABLES (the crdb_region column stays
hidden, unless explicitly requested). Also validate that while we're not
able to import into RBR tables, we're able to import into a similarly
looking table, and then convert it into a RBR table.
Release note: None