change(console): drop the use of open_memstream() (IDFGH-11361)

[alonbl]

the argtable3 provides string based output return, there is no need to go via stdio structures.

I found this usage during the review of #12493, we can implement this simpler, this code is the same as what runs in argparse3 when using open_memstream().

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[alonbl]

Hi @0xjakob, can you please also review this one?

[igrr]

sha=270112fdaf8c414364b73a9029206de76ae64c8f