fix: exclude the change of ownership for dblink functions (joe#124)

Description

The database may already contain functions that can be used to steal data. We need to forbid potentially dangerous features to protect users from this.

So, the MR excludes the change of ownership for the dblink functions.

Related issue

joe#124

Examples

Checklist

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes, specifications reflect those changes and they have been reviewed OR there are no API changes

Closes #124 (closed)