Refactor GameMapManager a bit (nukes mapforced) (#11513)

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>
Closes https://github.com/space-wizards/space-station-14/issues/7192
Closes https://github.com/space-wizards/space-station-14/issues/6537
Closes https://github.com/space-wizards/space-station-14/issues/9579

Content.Server/Maps/GameMapPrototype.cs

@@ -2,6 +2,7 @@ using Content.Server.Station;
 using JetBrains.Annotations;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Utility;
+using System.Diagnostics;
 
 namespace Content.Server.Maps;
 
@@ -13,6 +14,7 @@ namespace Content.Server.Maps;
 /// Make a new partial for your fancy new feature, it'll save you time later.
 /// </remarks>
 [Prototype("gameMap"), PublicAPI]
+[DebuggerDisplay("GameMapPrototype [{ID} - {MapName}]")]
 public sealed partial class GameMapPrototype : IPrototype
 {
     /// <inheritdoc/>