Refactor SQLite Database Provider

- Removed unused classes and files related to SQLite database provider, including SqliteDesignTimeJellyfinDbFactory, ModelBuilderExtensions, PragmaConnectionInterceptor, AssemblyInfo, SqliteDatabaseProvider, DateTimeKindValueConverter.
- Updated tests to remove dependencies on removed classes and adjusted mocking for configuration sections.
- Added Microsoft.EntityFrameworkCore.Sqlite package reference to test project.
- Improved string handling in tests for better consistency and clarity.
- Refactored logging methods in JellyfinApplicationFactory for better readability and maintainability.

tests/Jellyfin.Server.Implementations.Tests/HttpServer/WebSocketConnectionTests.cs

@@ -2,6 +2,8 @@
 // Copyright (c) PlaceholderCompany. All rights reserved.
 // </copyright>
 
+#pragma warning disable CA1517 // Do not use overloads of StartsWith/EndsWith with char when multiple characters are expected
+
 namespace Jellyfin.Server.Implementations.Tests.HttpServer
 {
     using System;
@@ -54,7 +56,7 @@ namespace Jellyfin.Server.Implementations.Tests.HttpServer
 
         internal sealed class BufferSegment : ReadOnlySequenceSegment<byte>
         {
-            public BufferSegment(Memory<byte> memory)
+            public BufferSegment(ReadOnlyMemory<byte> memory)
             {
                 Memory = memory;
             }