Cleanup extracted files (#13760)

* Cleanup extracted files

* Pagination and fixes

* Add migration for attachments to MigrateLibraryDb

* Unify attachment handling

* Don't extract again if files were already extracted

* Fix MKS attachment extraction

* Always run full extraction on mks

* Don't try to extract mjpeg streams as attachments

* Fallback to check if attachments were extracted to cache folder

* Fixup

MediaBrowser.Model/Entities/MediaAttachment.cs

@@ -1,51 +1,49 @@
-#nullable disable
-namespace MediaBrowser.Model.Entities
+namespace MediaBrowser.Model.Entities;
+
+/// <summary>
+/// Class MediaAttachment.
+/// </summary>
+public class MediaAttachment
 {
     /// <summary>
-    /// Class MediaAttachment.
+    /// Gets or sets the codec.
     /// </summary>
-    public class MediaAttachment
-    {
-        /// <summary>
-        /// Gets or sets the codec.
-        /// </summary>
-        /// <value>The codec.</value>
-        public string Codec { get; set; }
+    /// <value>The codec.</value>
+    public string? Codec { get; set; }
 
-        /// <summary>
-        /// Gets or sets the codec tag.
-        /// </summary>
-        /// <value>The codec tag.</value>
-        public string CodecTag { get; set; }
+    /// <summary>
+    /// Gets or sets the codec tag.
+    /// </summary>
+    /// <value>The codec tag.</value>
+    public string? CodecTag { get; set; }
 
-        /// <summary>
-        /// Gets or sets the comment.
-        /// </summary>
-        /// <value>The comment.</value>
-        public string Comment { get; set; }
+    /// <summary>
+    /// Gets or sets the comment.
+    /// </summary>
+    /// <value>The comment.</value>
+    public string? Comment { get; set; }
 
-        /// <summary>
-        /// Gets or sets the index.
-        /// </summary>
-        /// <value>The index.</value>
-        public int Index { get; set; }
+    /// <summary>
+    /// Gets or sets the index.
+    /// </summary>
+    /// <value>The index.</value>
+    public int Index { get; set; }
 
-        /// <summary>
-        /// Gets or sets the filename.
-        /// </summary>
-        /// <value>The filename.</value>
-        public string FileName { get; set; }
+    /// <summary>
+    /// Gets or sets the filename.
+    /// </summary>
+    /// <value>The filename.</value>
+    public string? FileName { get; set; }
 
-        /// <summary>
-        /// Gets or sets the MIME type.
-        /// </summary>
-        /// <value>The MIME type.</value>
-        public string MimeType { get; set; }
+    /// <summary>
+    /// Gets or sets the MIME type.
+    /// </summary>
+    /// <value>The MIME type.</value>
+    public string? MimeType { get; set; }
 
-        /// <summary>
-        /// Gets or sets the delivery URL.
-        /// </summary>
-        /// <value>The delivery URL.</value>
-        public string DeliveryUrl { get; set; }
-    }
+    /// <summary>
+    /// Gets or sets the delivery URL.
+    /// </summary>
+    /// <value>The delivery URL.</value>
+    public string? DeliveryUrl { get; set; }
 }