test(hr): Prevent cross-tests impacts

src/Uno.UI.RuntimeTests/Tests/HotReload/Frame/HRApp/Tests/Given_TextBlock.cs

@@ -121,7 +121,15 @@ public async Task When_Changing_TextBlock_UsingHRClient_NoChanges()
 			true)
 			.WithExtendedTimeouts(); // Required for CI
 
-		await hr.UpdateFileAsync(req, ct);
+		try
+		{
+			await hr.UpdateFileAsync(req, ct);
+		}
+		finally
+		{
+			// Make sure to undo to not impact other tests!
+			await hr.UpdateFileAsync(req.Undo(waitForHotReload: false), CancellationToken.None);
+		}
 	}
 
 	// Another version of the test above, but pausing the TypeMapping before calling the file update