[clang] [Clang] Mark P1061 (Structured Bindings can introduce a Pack) as implemented (PR #127980)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman approved this pull request.

LGTM, though I changed the patch summary to link it to the implementation work.

https://github.com/llvm/llvm-project/pull/127980