Rename Resources folder as it has special meaning in the context of Unity where it may import resources automatically into users' projects. (#3853)

com.unity.ml-agents/Tests/Editor/ModelRunnerTest.cs

     [TestFixture]
     public class ModelRunnerTest
     {
-        const string k_continuous2vis8vec2actionPath = "Packages/com.unity.ml-agents/Tests/Editor/Resources/continuous2vis8vec2action.nn";
-        const string k_discrete1vis0vec_2_3action_recurrModelPath = "Packages/com.unity.ml-agents/Tests/Editor/Resources/discrete1vis0vec_2_3action_recurr.nn";
+        const string k_continuous2vis8vec2actionPath = "Packages/com.unity.ml-agents/Tests/Editor/TestModels/continuous2vis8vec2action.nn";
+        const string k_discrete1vis0vec_2_3action_recurrModelPath = "Packages/com.unity.ml-agents/Tests/Editor/TestModels/discrete1vis0vec_2_3action_recurr.nn";
         NNModel continuous2vis8vec2actionModel;
         NNModel discrete1vis0vec_2_3action_recurrModel;
         Test3DSensorComponent sensor_21_20_3;

com.unity.ml-agents/Tests/Editor/ParameterLoaderTest.cs

     [TestFixture]
     public class ParameterLoaderTest
     {
-        const string k_continuous2vis8vec2actionPath = "Packages/com.unity.ml-agents/Tests/Editor/Resources/continuous2vis8vec2action.nn";
-        const string k_discrete1vis0vec_2_3action_recurrModelPath = "Packages/com.unity.ml-agents/Tests/Editor/Resources/discrete1vis0vec_2_3action_recurr.nn";
+        const string k_continuous2vis8vec2actionPath = "Packages/com.unity.ml-agents/Tests/Editor/TestModels/continuous2vis8vec2action.nn";
+        const string k_discrete1vis0vec_2_3action_recurrModelPath = "Packages/com.unity.ml-agents/Tests/Editor/TestModels/discrete1vis0vec_2_3action_recurr.nn";
         NNModel continuous2vis8vec2actionModel;
         NNModel discrete1vis0vec_2_3action_recurrModel;
         Test3DSensorComponent sensor_21_20_3;

com.unity.ml-agents/Tests/Editor/TestModels.meta

+fileFormatVersion: 2
+guid: 95997790219c547e584c3cb50122a95f
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

com.unity.ml-agents/Tests/Editor/Resources.meta

-fileFormatVersion: 2
-guid: 22f1c3c8541da48e480c6b921343c2ee
-folderAsset: yes
-DefaultImporter:
-  externalObjects: {}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: