## Problem description
When calling `repository.UserRepository().Get(...)` the following error
got returned caused by scanning.
`Scan error: scanning: doing scan: scanFn: scany: scan row into struct
fields: sql: Scan error on column index 7, name "metadata": unsupported
Scan, storing driver.Value type []uint8 into type *[]*domain.Metadata`
## How the problem got solved
The issue was that json arrays were not properly unmarshalled during
scanning the rows into structs.
## Additional changes
The issue could also happen on login names, therefore it got fixed for
this field too. Other fields are not affected because we use
`json.RawMessage` for the specific user types.
## Additional information
Introduced in https://github.com/zitadel/zitadel/pull/10967
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