[clang] [clang-format] Allow array alignment on non-rectangular arrays (PR #143781)

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owenca wrote:

> @owenca just a friendly bump on this review. The main question is currently whether changing tests is acceptable.

See https://github.com/llvm/llvm-project/pull/143781#issuecomment-3071784802. For example, https://github.com/llvm/llvm-project/pull/143781#discussion_r2312911081 is worse than before.

https://github.com/llvm/llvm-project/pull/143781