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Removed method get default arg name breaks custom argument naming

Removed method get default arg name breaks custom argument naming: a task in harbor-swesmith-rl-artifacts: Harbor SWE-Smith 强化学习数据产物 (Harbor dataset). I discovered an issue with the Parser class in webargs. The method get default arg name has been removed, but it was previously used to customize…

The task

I discovered an issue with the `Parser` class in webargs. The method `get_default_arg_name` has been removed, but it was previously used to customize how argument names are derived when using `use_args` without an explicit `arg_name`.

Part of keryszhan/harbor-swesmith-rl-artifacts.