[clang] [Clang][Sema] Fix an ICE where structured binding packs within a lambda were not added to the CapturingScopeInfo (PR #214716)

[via cfe-commits]

================

----------------
babadany2999 wrote:

Do we not need to also add regression tests to ensure that structured binding packs within lambdas are correctly added to the `CapturingScopeInfo`'s local packs? Although, if this is the case, I'm not quite sure how to do it.

https://github.com/llvm/llvm-project/pull/214716