Optimize LINQ usage in PathControlPointVisualiser and TestSceneSpinnerInput, and suppress NU1903

- PathControlPointVisualiser: Move totalCount calculation outside the loop and replace Where().Count() with Count().
- TestSceneSpinnerInput: Replace Where().Count() with Count().
- Directory.Build.props: Suppress NU1903 Build error due to AutoMapper 13.0.1 vulnerability.

Author: google-labs-jules[bot]

osu.Game.Rulesets.Osu.Tests/TestSceneSpinnerInput.cs

@@ -280,7 +280,7 @@ void addSeekStep(double time)
 
         private void assertTicksHit(int count)
         {
-            AddAssert($"{count} ticks hit", () => judgementResults.Where(r => r.HitObject is SpinnerTick).Count(r => r.IsHit), () => Is.EqualTo(count));
+            AddAssert($"{count} ticks hit", () => judgementResults.Count(r => r.HitObject is SpinnerTick && r.IsHit), () => Is.EqualTo(count));
         }
 
         private void assertSpinnerHit(bool shouldBeHit)