* dotnet/dev15.6.x:
  Fix symbol completion after 'in' (#24335)
  use PascalCase for const name
  Limit compiler server pipe name length (#24265)
  Test ConvertedType on LHS of deconstruction-assignment (#24158)
  remove unused usings
  use .editorconfig files
  address more comments
  address code review comments
  move newly added text into resource file
  add text and hyperlink to C# code style page