[clang-tidy] misc-coroutine-hostile-raii cannot detect hostile types inside containers

There's currently no way to make `Container` raise a warning:
```c++
Task SampleCoro() {
{
MyRaiiType v;
co_await std::suspend_always{}; // OK, warns here
}
{
std::optional v;
co_await std::suspend_always{}; // No warning
}
}
```

https://godbolt.org/z/e4onKdj16

Start with the clang-tidy misc-coroutine-hostile-raii check and reproduce the example from the linked Godbolt case. Trace how the check handles MyRaiiType across co_await, then extend the investigation to std::optional and other ContainerHostileType cases. Done means hostile RAII types nested in containers produce the expected warning.

Written by the indexing model from the issue text.