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sql: fix bad interraction with DROP region rollback and alter to RBR
When altering to a regional by row table we only add partitions for PUBLIC enum values (regions). The type schema change job that negotiates promotion/demotion is responsible for re-partitioning regional by row tables. Previously, this re-partitioning only happened if the type schema change job succeeded. This behavior missed an edge case, which looks like: - Client 1 drops region A from the database. The user txn commits. - Client 2 alters table t to a RBR. - The drop region fails, and therefore rolls back. - table t is now missing a partition for region A. This patch fixes this problem by trigerring a re-partition even when the type schema change job is rolling back. Informs cockroachdb#63462 Release note (bug fix): Previously if a user altered a table to REGIONAL BY ROW when a region was being dropped, and the drop failed and had to be rolled back, it could have resulted in the Regional By Row table missing a partition for this region. This is now fixed and region drop failure rollbacks are sane.
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