[v18] Fix long role names for MySQL auto users #60377
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Previously, role names were effectively limited to 30 characters even though MySQL supports up to 32. The activation procedure now: - Unquotes the role name from JSON - Stores it in a TEXT variable (not a narrow VARCHAR) - Re-quotes with proper escaping before GRANT This allows full-length (32-char) role names to work.
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Backport #60339 to branch/v18
changelog: Fixed a bug that prevented using database role names longer than 30 chars for MySQL auto user provisioning. Now role names as long as 32 chars, which is the MySQL limit, can be used.