[clang] [clang-format] Rename option AlwaysBreakAfterReturnType. (PR #80827)

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rmarker wrote:

Thanks for updating `ConfigParseTest.cpp` @owenca and merging.

Do you also want to do the subsequent NFC commit directly? Like [7664ddf](https://github.com/llvm/llvm-project/commit/7664ddf8811242295abb837640cad8dd8cefb5e8).
Or do you want me to make another pull request for that?

https://github.com/llvm/llvm-project/pull/80827