[clang-tools-extra] [clang-tidy] fix false positive in bugprone-return-const-ref-from-parameter (PR #117734)

[Piotr Zegar via cfe-commits]

================
@@ -151,6 +151,12 @@ void instantiate(const int &param, const float &paramf, int &mut_param, float &m
         itf6(mut_paramf);
 }
 
+template<class T>
+void f(const T& t) {
+    const auto get = [&t] -> const T& { return t; };
+    return T{};
+}
----------------
PiotrZSL wrote:

Please add test:
```
const auto get = [](const T& t2) -> const T& { return t2; };
```
and verify that it's being still detected.

https://github.com/llvm/llvm-project/pull/117734