[clang] [clang-tools-extra] [clang][lex] Always pass suggested module to `InclusionDirective()` callback (PR #81061)

[Ben Langmuir via cfe-commits]

https://github.com/benlangmuir commented:

It would be good to update your commit message to talk about the benefits of this change: the callback now provides more information about the included header and models the associated module accurately regardless of whether it is translated to an import.

https://github.com/llvm/llvm-project/pull/81061