Improve Gas Yaml Serialization (#40070)

* Make yaml gas serialization cleaner

* fix exception

* fix validation code

* rudimentary test & permissive loading

* change it a bit

* Test fixes and adjustments

Content.Server/Atmos/EntitySystems/AtmosphereSystem.Gases.cs

@@ -458,11 +458,8 @@ namespace Content.Server.Atmos.EntitySystems
                     continue;
 
                 var doReaction = true;
-                for (var i = 0; i < prototype.MinimumRequirements.Length; i++)
+                for (var i = 0; i < Atmospherics.TotalNumberOfGases; i++)
                 {
-                    if(i >= Atmospherics.TotalNumberOfGases)
-                        throw new IndexOutOfRangeException("Reaction Gas Minimum Requirements Array Prototype exceeds total number of gases!");
-
                     var req = prototype.MinimumRequirements[i];
 
                     if (!(mixture.GetMoles(i) < req))