fix: explicitly replace postgresql by postgres in ATTACH

[zilto]

In dlt / sqlalchemy, postgresql or postgres are interchangeable values for drivername. Though, we pass this value to duckdb and it doesn't handle postgresql.

Connection with `client_type=DuckLakeSqlClient` to `dataset_name=repro_dataset_20250929040657` failed. Please check if you configured the credentials at all and provided the right credentials values. You can be also denied access or your internet connection may be down. The actual reason given is: IO Error: Failed to attach DuckLake MetaData "__ducklake_metadata_lake_catalog" at path + "postgresql:postgresql://loader:loader@localhost:5432/dlt_data"Extension "/home/tjean/.duckdb/extensions/v1.3.2/linux_amd64/postgresql.duckdb_extension" not found.

Candidate extensions: "postgres", "postgres_scanner", "sqlite", "sqlite3", "parquet"

Changes

• Explicitly convert postgresql to postgres when writing the ATTACH statement. It should be the only place where it's relevant
• Write a unit test

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[anuunchin]

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