Revert "Cleanup ExecutionSystem (#24382)" (#25555)

* Revert "Cleanup ExecutionSystem (#24382)"

This reverts commit bcbe2ec1af.

* Revert "Executions (#24150)"

This reverts commit 2e83f5a0ec.

# Conflicts:
#	Content.Shared/Weapons/Melee/SharedMeleeWeaponSystem.cs

Content.Shared/Execution/ExecutionComponent.cs

@@ -1,26 +0,0 @@
-using Robust.Shared.GameStates;
-
-namespace Content.Shared.Execution;
-
-/// <summary>
-/// Added to entities that can be used to execute another target.
-/// </summary>
-[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
-public sealed partial class ExecutionComponent : Component
-{
-    /// <summary>
-    /// How long the execution duration lasts.
-    /// </summary>
-    [DataField, AutoNetworkedField]
-    public float DoAfterDuration = 5f;
-
-    [DataField, AutoNetworkedField]
-    public float DamageModifier = 9f;
-
-    // Not networked because this is transient inside of a tick.
-    /// <summary>
-    /// True if it is currently executing for handlers.
-    /// </summary>
-    [DataField]
-    public bool Executing = true;
-}