[clang] [Sema][CTAD] Allow user defined conversion for copy-list-initialization (PR #94752)

[Younan Zhang via cfe-commits]

https://github.com/zyn0217 commented:

Thanks for working on this. While I didn't dig into the details in `DeduceTemplateSpecializationFromInitializer()`, I think the test could be improved before proceeding. I also wish @erichkeane and @hokein could take a look at this because they have more expertise in CTAD. :)

https://github.com/llvm/llvm-project/pull/94752