### Apache Airflow version

2.7.1

### What happened

Airflow's postgres connection configuration form has a field called  'schema'  which is misguiding as values mentioned here is used to refer to the database name instead of the schema name. It should be correctly named to 'database' or 'dbname'

### What you think should happen instead

_No response_

### How to reproduce

create a connection on the web UI and choose connection type as postgres.
Have a dag connect to an postgres server with multiple databases
provide the database name in the 'schema' field of the connection form- this would work if nothing else is incorrect in the etl
now change the value in the schema field of the connection form to refer to a schema- this will fail unexpectedly as the schema name field actually points to the database name.

### Operating System

Windows and Linux

### Versions of Apache Airflow Providers

2.71

### Deployment

Docker-Compose

### Deployment details

_No response_

### Anything else

_No response_

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

"""Extract the URI from the connection.
        :return: the extracted uri.
        """
        conn = self.get_connection(getattr(self, self.conn_name_attr))
        conn.schema = self.database or conn.schema
        uri = conn.get_uri().replace("postgres://", "postgresql://")
        return uri
    def bulk_load(self, table: str, tmp_file: str) -> None:
        """Loads a tab-delimited file into a database table."""
        self.copy_expert(f"COPY {table} FROM STDIN", tmp_file)
    def bulk_dump(self, table: str, tmp_file: str) -> None:
        """Dumps a database table into a tab-delimited file."""
        self.copy_expert(f"COPY {table} TO STDOUT", tmp_file)
    @staticmethod
    def _serialize_cell(cell: object, conn: connection | None = None) -> Any:
        """Serialize a cell.
        PostgreSQL adapts all arguments to the ``execute()`` method internally,
        hence we return the cell without any conversion.
        See http://initd.org/psycopg/docs/advanced.html#adapting-new-types for
        more information.
        :param cell: The cell to insert into the table
        :param conn: The database connection
        :return: The cell
        """
        return cell
    def get_iam_token(self, conn: Connection) -> tuple[str, str, int]: