Fixes https://github.com/payloadcms/payload/issues/12263
This was caused by passing not needed columns to the `SELECT DISTINCT`
query, which we execute in case if we have a filter / sort by a nested
field / relationship. Since the only columns that we need to pass to the
`SELECT DISTINCT` query are: ID and field(s) specified in `sort`, we now
filter the `selectFields` variable.