Remove PoolSettings.ExtraPrototypes option (#18678)

Content.IntegrationTests/Tests/Chemistry/TryAllReactionsTest.cs

@@ -13,6 +13,7 @@ namespace Content.IntegrationTests.Tests.Chemistry
     [TestOf(typeof(ReactionPrototype))]
     public sealed class TryAllReactionsTest
     {
+        [TestPrototypes]
         private const string Prototypes = @"
 - type: entity
   id: TestSolutionContainer
@@ -22,13 +23,13 @@ namespace Content.IntegrationTests.Tests.Chemistry
       beaker:
         maxVol: 50
         canMix: true";
+
         [Test]
         public async Task TryAllTest()
         {
             await using var pairTracker = await PoolManager.GetServerClient(new PoolSettings
             {
-                NoClient = true,
-                ExtraPrototypes = Prototypes
+                NoClient = true
             });
             var server = pairTracker.Pair.Server;