Update .editorconfig to correspond Code Conventions (#26824)

Update editorconfig to Code Style

End of line is: CRLF (suggestion)
Namespace declarations are: file scoped (suggestion). Instead of block scoped

.editorconfig

@@ -9,7 +9,7 @@ indent_style = space
 tab_width = 4
 
 # New line preferences
-#end_of_line = crlf
+end_of_line = crlf:suggestion
 insert_final_newline = true
 trim_trailing_whitespace = true
 
@@ -104,6 +104,7 @@ csharp_preferred_modifier_order = public, private, protected, internal, new, abs
 
 # 'using' directive preferences
 csharp_using_directive_placement = outside_namespace:silent
+csharp_style_namespace_declarations = file_scoped:suggestion
 
 #### C# Formatting Rules ####