[clang-tools-extra] [clang-tidy] Remove deprecated `ClangTidyModuleRegistry.h` (PR #215055)

[Yanzuo Liu via cfe-commits]

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@@ -56,6 +56,10 @@ infrastructure are described first, followed by tool-specific sections.
 
 ### Potentially Breaking Changes
 
+- In LLVM22, The `clang-tidy/ClangTidyModuleRegistry.h` header was deprecated.
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zwuis wrote:

I'm fine with either. I see libc++ always uses LLVMXX.

https://github.com/llvm/llvm-project/pull/215055