[UITests] Screen Ruler (#40999)

## Summary of the Pull Request
Basic UI Tests for Screen Ruler module

## PR Checklist

- [ ] Closes: https://github.com/microsoft/PowerToys/issues/40670
- [x] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [x] **Tests:** Added/updated and all pass
- [x] **Dev docs:** Added/updated

## Detailed Description of the Pull Request / Additional comments
Covered test cases you can find in this issue:
https://github.com/microsoft/PowerToys/issues/40670

src/common/UITestAutomation/ModuleConfigData.cs

@@ -33,6 +33,7 @@ namespace Microsoft.PowerToys.UITest
         Workspaces,
         PowerRename,
         CommandPalette,
+        ScreenRuler,
     }
 
     /// <summary>
@@ -104,6 +105,7 @@ namespace Microsoft.PowerToys.UITest
                 [PowerToysModule.Workspaces] = new ModuleInfo("PowerToys.WorkspacesEditor.exe", "Workspaces Editor"),
                 [PowerToysModule.PowerRename] = new ModuleInfo("PowerToys.PowerRename.exe", "PowerRename", "WinUI3Apps"),
                 [PowerToysModule.CommandPalette] = new ModuleInfo("Microsoft.CmdPal.UI.exe", "PowerToys Command Palette", "WinUI3Apps\\CmdPal"),
+                [PowerToysModule.ScreenRuler] = new ModuleInfo("PowerToys.MeasureToolUI.exe", "PowerToys.ScreenRuler", "WinUI3Apps"),
             };
         }