[clang] [LifetimeSafety] Allow configuring lifetimebound fix-it spelling (PR #204045)

[via cfe-commits]

https://github.com/NeKon69 commented:

Also I am wondering if we should test this in [misplaced-lifetimebound-intra-tu.cpp](https://github.com/llvm/llvm-project/blob/main/clang/test/Sema/LifetimeSafety/misplaced-lifetimebound-intra-tu.cpp) too?

https://github.com/llvm/llvm-project/pull/204045