[clang] [Clang][Sema] Diagnose variable template explicit specializations with storage-class-specifiers (PR #93873)

[via cfe-commits]

alexfh wrote:

There's more (https://gcc.godbolt.org/z/YKKah8M1n):
```
class D {
template <unsigned N>
static constexpr int kMaxUnsignedInt = 2 * kMaxUnsignedInt<N - 1> + 1;

template <>
constexpr auto kMaxUnsignedInt<1> = 1;
};
```
fails to compile with 
```
<source>:14:11: error: 'auto' not allowed in non-static class member
   14 | constexpr auto kMaxUnsignedInt<1> = 1;
      |           ^~~~
```

https://github.com/llvm/llvm-project/pull/93873
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