[clang] [clang-format] Handle variable declarations in BreakAfterAttributes (PR #71755)

[Owen Pan via cfe-commits]

owenca wrote:

> However this doesn't address the second part of the linked issue (with the `if`) does it?

Nope! That part is a duplicate of #64474. I was going to add a note in #71563 before merging this PR but now just saw that @FalcoGer closed the old issue and opened the new one, which is essentially the same.

https://github.com/llvm/llvm-project/pull/71755