misc: chore: [ci skip] Remove unused 'using' directives from solution

src/Ryujinx.Graphics.Vulkan/Vendor.cs

 using Silk.NET.Vulkan;
-using System.Text.RegularExpressions;
 
 namespace Ryujinx.Graphics.Vulkan
 {

src/Ryujinx.HLE/HOS/Applets/Error/ErrorApplet.cs

@@ -15,7 +15,6 @@ using System.IO;
 using System.Linq;
 using System.Runtime.InteropServices;
 using System.Text;
-using System.Text.RegularExpressions;
 
 namespace Ryujinx.HLE.HOS.Applets.Error
 {

src/Ryujinx.Horizon/HorizonStatic.cs

-using MsgPack;
 using Ryujinx.Horizon.Common;
 using Ryujinx.Horizon.Prepo.Types;
 using Ryujinx.Memory;

src/Ryujinx/DiscordIntegrationModule.cs

 using DiscordRPC;
 using Gommon;
-using MsgPack;
 using Ryujinx.Ava.Utilities;
 using Ryujinx.Ava.Utilities.AppLibrary;
 using Ryujinx.Ava.Utilities.Configuration;
@@ -11,7 +10,6 @@ using Ryujinx.HLE;
 using Ryujinx.HLE.Loaders.Processes;
 using Ryujinx.Horizon;
 using Ryujinx.Horizon.Prepo.Types;
-using System.Linq;
 using System.Text;
 
 namespace Ryujinx.Ava

src/Ryujinx/UI/Controls/ApplicationDataView.axaml.cs

-using Avalonia;
-using Avalonia.Controls;
+using Avalonia.Controls;
 using Avalonia.Input.Platform;
 using Avalonia.Interactivity;
 using Avalonia.Styling;
 using FluentAvalonia.UI.Controls;
-using Ryujinx.Ava;
 using Ryujinx.Ava.Common.Locale;
-using Ryujinx.Ava.UI.Controls;
 using Ryujinx.Ava.UI.Helpers;
 using Ryujinx.Ava.UI.ViewModels;
 using Ryujinx.Ava.UI.Windows;

src/Ryujinx/UI/Controls/ApplicationListView.axaml.cs

@@ -7,7 +7,6 @@ using Ryujinx.Ava.UI.ViewModels;
 using Ryujinx.Ava.Utilities.AppLibrary;
 using Ryujinx.Ava.Utilities.Compat;
 using System;
-using System.Globalization;
 using System.Linq;
 
 namespace Ryujinx.Ava.UI.Controls

src/Ryujinx/UI/Views/Settings/SettingsSystemView.axaml.cs

 using Avalonia.Controls;
-using Avalonia.Interactivity;
 using Ryujinx.Ava.UI.ViewModels;
 using TimeZone = Ryujinx.Ava.UI.Models.TimeZone;
 

src/Ryujinx/Utilities/PlayReport/Analyzer.cs

 using Gommon;
-using MsgPack;
 using Ryujinx.Ava.Utilities.AppLibrary;
 using System;
 using System.Collections.Generic;

src/Ryujinx/Utilities/PlayReport/MatchedValues.cs

 using MsgPack;
 using Ryujinx.Ava.Utilities.AppLibrary;
 using System.Collections.Generic;
-using System.Linq;
 
 namespace Ryujinx.Ava.Utilities.PlayReport
 {

src/Ryujinx/Utilities/PlayReport/PlayReports.cs

-using System;
-using System.Buffers.Binary;
-using System.Collections.Generic;
-using System.Linq;
-
-namespace Ryujinx.Ava.Utilities.PlayReport
+namespace Ryujinx.Ava.Utilities.PlayReport
 {
     public static partial class PlayReports
     {

src/Ryujinx/Utilities/PlayReport/Specs.cs

-using FluentAvalonia.Core;
-using MsgPack;
+using MsgPack;
 using Ryujinx.Ava.Utilities.AppLibrary;
 using System;
 using System.Collections.Generic;