Client customization late-join spawner priority for arrivals/cryostorage (#24586)

* Initial commit, requires server restart to take effect

* Exposes callbacks directly instead, takes effect immediately

* Cleaned up control flow, swapped cvar for client customization

* Switched to int, dictionary of callbacks, migration

* Update Content.Shared/Preferences/SpawnPriorityPreference.cs

* krunkle stan

---------

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/Database/ServerDbBase.cs

@@ -186,6 +186,8 @@ namespace Content.Server.Database
             if (Enum.TryParse<BackpackPreference>(profile.Backpack, true, out var backpackVal))
                 backpack = backpackVal;
 
+            var spawnPriority = (SpawnPriorityPreference) profile.SpawnPriority;
+
             var gender = sex == Sex.Male ? Gender.Male : Gender.Female;
             if (Enum.TryParse<Gender>(profile.Gender, true, out var genderVal))
                 gender = genderVal;
@@ -225,6 +227,7 @@ namespace Content.Server.Database
                 ),
                 clothing,
                 backpack,
+                spawnPriority,
                 jobs,
                 (PreferenceUnavailableMode) profile.PreferenceUnavailable,
                 antags.ToList(),