Update editorconfig file (#15038)

.editorconfig

@@ -11,25 +11,28 @@ indent_size = 2
 
 [*.cs]
 # Prefer "var" everywhere
-csharp_style_var_for_built_in_types                   = true : suggestion
-csharp_style_var_when_type_is_apparent                = true : suggestion
-csharp_style_var_elsewhere                            = true : suggestion
+csharp_style_var_for_built_in_types                        = true : suggestion
+csharp_style_var_when_type_is_apparent                     = true : suggestion
+csharp_style_var_elsewhere                                 = true : suggestion
 
 # Newline settings
-csharp_new_line_before_open_brace                     = all
-csharp_new_line_before_else                           = true
-csharp_new_line_before_catch                          = true
-csharp_new_line_before_finally                        = true
-csharp_new_line_before_members_in_object_initializers = true
-csharp_new_line_before_members_in_anonymous_types     = true
+csharp_new_line_before_open_brace                          = all
+csharp_new_line_before_else                                = true
+csharp_new_line_before_catch                               = true
+csharp_new_line_before_finally                             = true
+csharp_new_line_before_members_in_object_initializers      = true
+csharp_new_line_before_members_in_anonymous_types          = true
+
+dotnet_diagnostic.IDE0290.severity                         = none
+dotnet_diagnostic.IDE0305.severity                         = none
 
 # Sort using and Import directives with System.* appearing first
 dotnet_sort_system_directives_first                        = true
 
 # Code-block preferences
 csharp_prefer_braces = true
-csharp_prefer_simple_using_statement = true
-csharp_style_namespace_declarations = file_scoped
+csharp_prefer_simple_using_statement                       = true
+csharp_style_namespace_declarations                        = file_scoped:suggestion
 
 # Avoid "this." if not necessary
 dotnet_style_qualification_for_field                       = false : suggestion
@@ -42,11 +45,11 @@ dotnet_style_predefined_type_for_locals_parameters_members = true : suggestion
 dotnet_style_predefined_type_for_member_access             = true : suggestion
 
 # Suggest more modern language features when available
-csharp_style_pattern_matching_over_is_with_cast_check = true : none
-csharp_style_pattern_matching_over_as_with_null_check = true : none
-csharp_style_inlined_variable_declaration             = true : none
-csharp_style_throw_expression                         = true : none
-csharp_style_conditional_delegate_call                = true : none
+csharp_style_pattern_matching_over_is_with_cast_check      = true : none
+csharp_style_pattern_matching_over_as_with_null_check      = true : none
+csharp_style_inlined_variable_declaration                  = true : none
+csharp_style_throw_expression                              = true : none
+csharp_style_conditional_delegate_call                     = true : none
 
 dotnet_style_object_initializer                            = true : suggestion
 dotnet_style_collection_initializer                        = true : suggestion