make pulled uncuffing slower & reduce uncuff spam cooldown (#29008)

* prevent people being pulled from uncuffing themselves

* block -> modify duration

Content.Shared/Cuffs/Components/HandcuffComponent.cs

@@ -105,3 +105,9 @@ public record struct UncuffAttemptEvent(EntityUid User, EntityUid Target)
     public readonly EntityUid Target = Target;
     public bool Cancelled = false;
 }
+
+/// <summary>
+/// Event raised on an entity being uncuffed to determine any modifiers to the amount of time it takes to uncuff them.
+/// </summary>
+[ByRefEvent]
+public record struct ModifyUncuffDurationEvent(EntityUid User, EntityUid Target, float Duration);