[clang] [clang-format] Change LLVM style to BreakAfterAttributes == ABS_Leave (PR #70360)

[Owen Pan via cfe-commits]

owenca wrote:

> [Google](https://google.github.io/styleguide/cppguide.html) is the only one mentioning attributes:
> 
> > Attributes, and macros that expand to attributes, appear at the very beginning of the function declaration or definition, before the return type:
> > ```c++
> >  ABSL_ATTRIBUTE_NOINLINE void ExpensiveFunction();
> >  [[nodiscard]] bool IsOk();
> > ```
> 
> I'm not sure which `BreakAfterAttributes` option this boils down to, but I don't mind setting it back to `Never` for Google style if reviewers would like me to do so.

I think `Leave` would work.


https://github.com/llvm/llvm-project/pull/70360