[clang-tools-extra] [clang-tidy] Rename 'google-build-namespaces' check to 'misc-anonymous-namespace-in-header' and keep initial as alias. (PR #170986)

[Ondřej Štorc via cfe-commits]

================
@@ -1,7 +1,6 @@
 // RUN: clang-tidy %s -checks='-*,google-build-namespaces,google-build-using-namespace' -header-filter='.*' -- | FileCheck %s -implicit-check-not="{{warning|error}}:"
----------------
ostorc wrote:

This test file was also testing other checks, so maybe that was the reason for this "universal" name. Should I still change it?

https://github.com/llvm/llvm-project/pull/170986