gh-116159: argparse: performance improvement parsing large number of options (#116162)

When parsing positional vs optional arguments, the use of min with a
list comprehension inside of a loop results in quadratic time based
on the number of optional arguments given. When combined with use of
prefix based argument files and a large number of optional flags, this
can result in extremely slow parsing behavior.

This replaces the min call with a simple loop with a short circuit to
break at the next optional argument.

Co-authored-by: Zsolt Dollenstein <zsol.zsol@gmail.com>

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