After SERVER-81188 a shardCollection request is parsed using shardsvrCreateCollection parser. This was done to ensure full compatibility between the 2 requests. However, any extra field not allowed in shardCollection could be propagated to shardsvrCreateCollection if the field is present in shardsvrCreateCollection

Make sure to:

• parse the cmdObj using ShardCollection::parse
• remove shardsvrCreateCollection::parse
• set 1 by 1 every field in shardsvrCreateCollection using the corresponding setters.