Use mapped rest type member when expanding rest parameter names #39317
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Fixes #39227
Apologies to @ShuiRuTian in #39294 - I had this change staged locally but never got around to making a PR for it before the weekend (and only saw your PR when I just now went to put this up). I hope you'll forgive me for not guiding your change into becoming this one - the required fix really is small, though.
Update: This also fixes #39228, however I had to make some small changes to the test harness to actually test it (it did not support configuring the selected signature help item).