Merge branch 'mk/fix-bugs-and-failing-tests' of https://github.com/microsoft/OpenAPI.NET into mk/fix-bugs-and-failing-tests

Author: MaggieKimani1

src/Microsoft.OpenApi/Validations/Rules/JsonSchemaRules.cs

@@ -37,12 +37,13 @@ public static class JsonSchemaRules
                     // examples
                     context.Enter("examples");
 
-                    if (jsonSchema.GetExamples() != null)
+                    if (jsonSchema.GetExamples() is { } examples)
                     {
-                        for (int i = 0; i < jsonSchema.GetExamples().Count(); i++)
+                        var examplesCount = examples.Count();
+                        for (int i = 0; i < examplesCount; i++)
                         {
                             context.Enter(i.ToString());
-                            RuleHelpers.ValidateDataTypeMismatch(context, nameof(SchemaMismatchedDataType), jsonSchema.GetExamples().ElementAt(i), jsonSchema);
+                            RuleHelpers.ValidateDataTypeMismatch(context, nameof(SchemaMismatchedDataType), examples.ElementAt(i), jsonSchema);
                             context.Exit();
                         }