sql: prevent DROP OWNED BY with synthetic privileges

[cockroach-teamcity]

Exalate commented:

Related PR: cockroachdb/cockroach#86619
Commit: cockroachdb/cockroach@2bd3826

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Release note (sql change): DROP OWNED BY cannot be performed if the
user has synthetic privileges (in system.privileges)

Jira Issue: DOC-5465

[exalate-issue-sync]

Rafi Shamim (rafiss) commented:
I filed cockroachdb/cockroach#88149 to track the fix for resolving this limitation.

As far as documenting the limitation, we should say something like “{{DROP OWNED BY}} will result in an error if the user was granted a privilege using the {{GRANT SYSTEM ...}} command. To work around this, use {{SHOW SYSTEM GRANTS FOR }} and then use {{REVOKE SYSTEM ...}} for each privilege in the result."