fix(ui): enhance notification and authorization logic in UI components

[luannmoreira]

Description

This PR introduces several improvements to the notification handling and authorization logic in the UI. These updates modernize the code structure, enhance role-based permissions, and improve the maintainability of critical components.
Key Changes:

Authorizer Update:
    Added actions.notification.view to the authorizer object to enable role-based access to notification views.

Notification.vue Refactor:
    Migrated to <script setup> syntax for better readability and alignment with modern Vue practices.
    Simplified computed properties and watchers, consolidating logic for fetching and displaying notifications.
    Improved error handling for notifications, ensuring consistency across edge cases.

ApiKeyGenerate.vue Enhancement:
    Updated role logic by replacing isOwner with isAdmin to support both administrator and owner roles.
    Adjusted the dropdown role handling for API key roles to reflect these changes.

General Improvements:
    Reduced redundancy and improved code clarity in notification-related operations.
    Increased alignment of components with best practices.

Impact:

Improved UX: More consistent handling of notifications and API roles.
Code Maintainability: Refactored structure simplifies further enhancements and debugging.
Expanded Role Flexibility: Supports more nuanced role definitions for permissions.

Testing Notes:

Verify notification display and error handling under different roles and namespaces.
Test API key generation dropdown logic to ensure roles are correctly enabled/disabled based on permissions.
Confirm backward compatibility with existing user flows.