[clang-tools-extra] [clang-tidy] Add `readability-redundant-tag` check (PR #210007)

[via cfe-commits]

================
@@ -53,6 +53,7 @@ add_clang_library(clangTidyReadabilityModule STATIC
   RedundantSmartptrGetCheck.cpp
   RedundantStringCStrCheck.cpp
   RedundantStringInitCheck.cpp
+        RedundantTagCheck.cpp
----------------
EugeneZelenko wrote:

```suggestion
RedundantStringInitCheck.cpp
RedundantTagCheck.cpp
```

https://github.com/llvm/llvm-project/pull/210007