chore: fix failing tests

Author: MaggieKimani1

test/Microsoft.OpenAPI.OData.Reader.Tests/Generator/OpenApiSchemaGeneratorTests.cs

@@ -391,7 +391,6 @@ public async Task CreateStructuredTypePropertiesSchemaWithCustomAttributeReturns
               ""$ref"": ""#/components/schemas/microsoft.graph.userInsightsSettings""
             },
             {
-              ""type"": ""object"",
               ""nullable"": true
             }
           ],
@@ -404,7 +403,6 @@ public async Task CreateStructuredTypePropertiesSchemaWithCustomAttributeReturns
               ""$ref"": ""#/components/schemas/microsoft.graph.contactMergeSuggestions""
             },
             {
-              ""type"": ""object"",
               ""nullable"": true
             }
           ],
@@ -417,7 +415,6 @@ public async Task CreateStructuredTypePropertiesSchemaWithCustomAttributeReturns
               ""$ref"": ""#/components/schemas/microsoft.graph.regionalAndLanguageSettings""
             },
             {
-              ""type"": ""object"",
               ""nullable"": true
             }
           ],
@@ -430,7 +427,6 @@ public async Task CreateStructuredTypePropertiesSchemaWithCustomAttributeReturns
               ""$ref"": ""#/components/schemas/microsoft.graph.shiftPreferences""
             },
             {
-              ""type"": ""object"",
               ""nullable"": true
             }
           ],
@@ -926,7 +922,6 @@ public async Task CreatePropertySchemaForNullableEnumPropertyReturnSchema(OpenAp
                       "$ref": "#/components/schemas/DefaultNs.Color"
                     },
                     {
-                      "type": "object",
                       "nullable": true
                     }
                   ],

test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Basic.OpenApi.V2.yaml

@@ -680,11 +680,11 @@ definitions:
       type: object
   ReferenceNumeric:
     type: string
-    x-nullable: true
     enum:
       - '-INF'
       - INF
       - NaN
+    x-nullable: true
   DefaultNs.Color:
     type: string
     description: Enum type 'Color' description.

test/Microsoft.OpenAPI.OData.Reader.Tests/Resources/Empty.OpenApi.V2.yaml

@@ -71,11 +71,11 @@ definitions:
       type: object
   ReferenceNumeric:
     type: string
-    x-nullable: true
     enum:
       - '-INF'
       - INF
       - NaN
+    x-nullable: true
 parameters:
   top:
     in: query