feat(ovpnrw): connections history from storage if available

[m-dilorenzi]

This pull request refactors the OpenVPN RW connections history feature to improve performance, usability, and code maintainability. The most significant changes include switching from local data filtering to server-side querying with pagination and sorting, updating the UI to handle asynchronous states, and simplifying component responsibilities.

Data fetching and filtering improvements:

• Replaced local filtering and manual pagination in ConnectionsHistory.vue with server-side querying using @tanstack/vue-query, including debounced search, route-persisted filters, sorting, and pagination. This enables more efficient handling of large datasets and improves responsiveness.
• Removed obsolete local filtering functions and related state, shifting all filtering, sorting, and pagination logic to the backend and query parameters.

UI and component updates:

• Updated ConnectionsHistory.vue and UserConnectionsTable.vue to use new query state variables (isPending, isSuccess, isError, etc.) for displaying loading skeletons, error notifications, and empty states, improving user feedback and clarity.
• Modified UserConnectionsTable.vue to receive paginated, sorted data and control parameters as props, removing internal sorting and pagination logic, and emitting events for parent control.

Error handling and filter reset enhancements:

• Separated download error handling from query errors, providing distinct notifications for download failures and query issues. Updated filter reset logic to clear all filters and reset page state.

Closes: NethServer/nethsecurity#1404