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

[via cfe-commits]

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EugeneZelenko wrote:

```suggestion
    CheckFactories.registerCheck<RedundantTagCheck>(
        "readability-redundant-tag");
    CheckFactories.registerCheck<RedundantTypenameCheck>(
```

Also this entire calls sequence should be sorted.

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