[3.10] gh-96151: Use a private name for passing builtins to dataclass. This now allows for a field named BUILTIN (gh-98143) (gh-98899)

gh-96151: Use a private name for passing builtins to dataclass. This now allows for a field named BUILTIN (gh-98143)
(cherry picked from commit 29f98b46b77ee528477b9a7b335974b9682f7f14)

Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>

Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>