fix: Changes Map.Sector.Mobiles to link list & Fixes various related crash bugs (#1553)

### Summary

Eliminates `IPooledEnumerable<T>` and `eable.Free()` from `Map` for mobiles. This drastically simplifies code that iterates in range, for example:

```cs
foreach (var m in m.GetMobilesInRange(5))
{
}
```
The code above no longer requires an eable and calling `Free()`.

- [X] Fixed several locations where an NPC that was damaged would cause a server crash.
- [X] Removed an unnecessary allocation in guard fake calls (NPCs calling guards on you)
- [X] Fixes damage precision loss in Poison Strike Spell
- [X] BogThing no longer attempts to "search" for boglings to eat when it is at full health

Projects/UOContent/Spells/Fourth/ArchProtection.cs

@@ -48,10 +48,8 @@ namespace Server.Spells.Fourth
                     return;
                 }
 
-                var eable = Caster.Map.GetMobilesInRange(loc, Core.AOS ? 2 : 3);
                 using var targets = PooledRefQueue<Mobile>.Create();
-
-                foreach (var m in eable)
+                foreach (var m in Caster.Map.GetMobilesInRange(loc, Core.AOS ? 2 : 3))
                 {
                     if (Caster.CanBeBeneficial(m, false))
                     {