[clang] [Sema] Fix computations of "unexpanded packs" in substituted lambdas (PR #99882)

[Younan Zhang via cfe-commits]

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+// RUN: %clang_cc1 -fsyntax-only -std=c++20 -verify %s
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zyn0217 wrote:

It would be very nice if you can merge other tests from #86265 e.g. tests including constraints/noexcepts specifiers. That way this could completely supersede that. 

https://github.com/llvm/llvm-project/pull/99882