Shards damage barefoot users + steptrigger-related general cleanup (#9585)

Content.Shared/StepTrigger/Components/ShoesRequiredStepTriggerComponent.cs

@@ -0,0 +1,11 @@
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.StepTrigger.Components;
+
+/// <summary>
+/// This is used for cancelling step trigger events if the user is wearing shoes, such as for glass shards.
+/// </summary>
+[RegisterComponent, NetworkedComponent]
+public sealed class ShoesRequiredStepTriggerComponent : Component
+{
+}