fix(misc): Update stress-test-many-posts

[jefft0]

This is a maintenance PR, following the original PR #1583, to update stress-test-many-posts to the latest gno.

• Use the latest gnonative which is consistent with the latest gno
• Use the archived boards realm at gno.land/r/archive/boards, since this was the original test and its API is simpler
• Update the README

[Gno2D2]

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