Fix guideentryprototypetests (#24427)

It hits the style update limit so try running a tick and see if we can avoid having too many queued.

Content.IntegrationTests/Tests/Guidebook/GuideEntryPrototypeTests.cs

@@ -23,17 +23,18 @@ public sealed class GuideEntryPrototypeTests
         var parser = client.ResolveDependency<DocumentParsingManager>();
         var prototypes = protoMan.EnumeratePrototypes<GuideEntryPrototype>().ToList();
 
-        await client.WaitAssertion(() =>
-        {
-            Assert.Multiple(() =>
-            {
         foreach (var proto in prototypes)
         {
-                    var text = resMan.ContentFileReadText(proto.Text).ReadToEnd();
+            await client.WaitAssertion(() =>
+            {
+                using var reader = resMan.ContentFileReadText(proto.Text);
+                var text = reader.ReadToEnd();
                 Assert.That(parser.TryAddMarkup(new Document(), text), $"Failed to parse guidebook: {proto.Id}");
+            });
+
+            // Avoid styleguide update limit
+            await client.WaitRunTicks(1);
         }
-            });
-        });
 
         await pair.CleanReturnAsync();
     }