[clang] [clang-format] Handle templated elaborated type specifier in function… (PR #77013)

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XDeme wrote:

I have updated the comment a little, because there is some case we can't handle:
```cpp
template<typename T>
struct Goo<T> F() {}
```
we can't distinguish if this is a class or function. We could check if F() is macro by checking
if it is all uppercase, to identify a macro, but I am not sure if this is good.

https://github.com/llvm/llvm-project/pull/77013