Add sort and filter

[StefH]

No description provided.

[Copilot]

Pull Request Overview

This PR adds sort and filter functionality to the Azure App Registrations Manager WinUI application. The changes enable users to search through application registrations and sort the data grid columns.

• Added search capabilities for App ID, Display Name, Object ID, and Enterprise Application ID
• Implemented column sorting functionality for the data grid
• Applied consistent GUID styling using Consolas font

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
MainWindow.xaml.cs	Added search properties, filter logic, backup data handling, and column sorting implementation
MainWindow.xaml	Added search UI controls, configured sortable columns, and applied GUID styling to the data grid
OverviewUserControl.xaml	Applied consistent GUID styling to text boxes displaying IDs

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