[clang-tools-extra] [clang-tidy] add fixhint for misc-use-internal-linkage (PR #96203)

[Julian Schmidt via cfe-commits]

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5chmidti wrote:

The other two functions have fixes as well. I'd argue that template declarations don't need to be inside anonymous namespaces/`static`, but that's outside the scope of this pr.

Either way, this pr should check that both have an attached fixit:
`// CHECK-FIXES: static void func_template() {}`
`// CHECK-FIXES: static void func_cpp_inc();`

https://github.com/llvm/llvm-project/pull/96203