Fix: no automatic foreign keys referencing partitions

[s-sokolko]

When using atlas migrate diff and the schema contains partitioned tables the autogenerated migration sometimes contains duplicate foreign key constraints. It happens when there is a foreign key in DB schema that references a partitioned table. In this case the foreign key search sql filters tables by the source table of the FK only, But we have to filter also by the target table, because if we don't the query also gives us all the partitions of tha partitioned table aprat from the partitioned table itself.
I've faced this situation using Postgres. My fix adds checks and some query formatting.

[a8m]

Thanks for the contribution, @s-sokolko.

However, I won’t merge this as it conflicts with our current work on supporting partitions (which should be released soon). I appreciate your effort.