Reduce allocations, simplifed code, faster implementation, included tests - StreamInfo.ToUrl (#9369)

* Rework PR 6168

* Fix test

src/Jellyfin.Extensions/EnumerableExtensions.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 
 namespace Jellyfin.Extensions;
 
@@ -55,4 +56,22 @@ public static class EnumerableExtensions
     {
         yield return item;
     }
+
+    /// <summary>
+    /// Gets an IEnumerable consisting of all flags of an enum.
+    /// </summary>
+    /// <param name="flags">The flags enum.</param>
+    /// <typeparam name="T">The type of item.</typeparam>
+    /// <returns>The IEnumerable{Enum}.</returns>
+    public static IEnumerable<T> GetUniqueFlags<T>(this T flags)
+        where T : Enum
+    {
+        foreach (Enum value in Enum.GetValues(flags.GetType()))
+        {
+            if (flags.HasFlag(value))
+            {
+                yield return (T)value;
+            }
+        }
+    }
 }