Describe the bug

There are several issues related to managing privileges in pgAdmin for both PostgreSQL and EPAS.

To Reproduce

Steps to reproduce the behavior on EPAS and PostgreSQl:
Database -> Default Privileges -> Tables
Error: When creating privileges for DATABASE -> Default Privileges -> Tables, the following error occurs:

syntax error at or near "GRANT"
LINE 2: GRANT INSERT, SELECT ON TABLES TO testdb;
        ^

Database -> Default Privileges -> Sequences and Functions

1. When creating the first privilege and saving, reopening the properties shows multiple auto-created privileges.
2. When updating the grantee of an existing privilege and saving, it creates a new privilege instead of updating the existing one.

Database -> Default Privileges -> Types

1. When creating and saving privileges for types, reopening the properties shows that the privileges are missing or removed automatically.
   (FYI:- SQL for type privileges is not generated.)

Schema -> Default Privileges -> Any Privileges

1. When updating an existing privilege, it creates a new privilege instead of updating the existing one.

Materialized Views, Views, Foreign Tables, and Partitions

1. When updating an existing privilege, it updating an existing privilege creates a new privilege rather than modifying the existing one.

UI/UX Issue with Privileges Dropdown

1. The Privileges dropdown input box appears like non-editable but is editable.
2. The dropdown functionality is unclear as it does not display the dropdown arrow, leading to confusion for users.

EPAS-Specific Issue:
Schema -> Default Privileges -> Privileges
When creating a privilege on a schema and saving it, reopening the privilege shows that it has been updated its WITH GRANT OPTION automatically.

Desktop (please complete the following information):

• OS: MacOS Sequoia 15.0.1
• Version: 8.14 (snapshot)
• Mode: Server
• Browser :- Chrome
• Package type: wheel