cockroachdb / cockroachdb/cockroach

sql: should disallow dropping objects with portals relying on it

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A-pausable-portals C-bug T-sql-queries
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Description

Currently, when there're cursors, we disallow schema changes. We should do similar restrictions for portals as well.
A more fine-grained control would be disallowing schema changes over the objects that existing cursors or portals rely on.

Jira issue: CRDB-25694

Epic CRDB-25183

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