[clang] [clang] Be const-correct with all uses of `Module *`. (PR #93493)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

One suggestion, if you are going to go about this problem systematically, try to tackle the hardest problems first.

For example: Try to make `MultiLevelTemplateArgumentList` const correct. I would like other suggestions as well.

https://github.com/llvm/llvm-project/pull/93493