As a QFieldCloud project configurator integrating postgres databases, I would like to be able to test my pg_service.conf secret so I am sure that the configuration I entered and my local firewall and database configurations are correct.

Acceptance criteria:

- I am able to run a connection test from the secrets configuration interface

- If the connection is successful (I can connect to a database) I would like to see a confirmation

- It the connection is not successful, I would like to see an error message with details (timeout, connection refused, wrong credentials, ...)