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

[purnima shrivastava via cfe-commits]

purnima-nlp wrote:

> We should also have a test for usage in templates:
> 
> ```c++
> struct Struct{};
> 
> template<typename T> void tf();
> 
> void f()
> {
>     tf<struct Struct>();
> }
> ```

yeah sure, i forgot that one, i will fix this, thankyou

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